I can confirm this bug in Gutsy RC. It is a desktop computer with a
Linksys WMP54G 2.0 PCI Adapter 20 meters away from a Linksys AP. I did
not have this problem in Feisty...

lspci:
00:00.0 Host bridge: VIA Technologies, Inc. P4M266 Host Bridge
00:01.0 PCI bridge: VIA Technologies, Inc. VT8633 [Apollo Pro266 AGP]
00:09.0 Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)
00:0b.0 Multimedia controller: Philips Semiconductors SAA7130 Video Broadcast 
Decoder (rev 01)
00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 80)
00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 80)
00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 80)
00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
00:11.1 IDE interface: VIA Technologies, Inc. 
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 
AC97 Audio Controller (rev 50)
01:00.0 VGA compatible controller: nVidia Corporation NV44A [GeForce 6200] (rev 
a1)

lsmod | grep rt2
rt2500pci              19072  0 
rt2x00pci              11520  1 rt2500pci
rt2x00lib              19584  2 rt2500pci,rt2x00pci
rfkill                  8208  1 rt2x00lib
mac80211              171016  4 rc80211_simple,rt2500pci,rt2x00pci,rt2x00lib
input_polldev           5896  1 rt2x00lib
crc_itu_t               3072  1 rt2x00lib
eeprom_93cx6            3200  1 rt2500pci

dmesg | grep ra0 (snnipet)
4 status=0)
[138620.323536] ra0: authenticated
[138620.323541] ra0: associate with AP 00:16:b6:cf:5e:be
[138620.325669] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[138620.325674] ra0: associated
[139399.705333] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[139399.705343] ra0: deauthenticated
[139399.720185] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[139400.719488] ra0: authenticate with AP 00:16:b6:cf:5e:be
[139400.721962] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[139400.721969] ra0: replying to auth challenge
[139400.725852] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[139400.725858] ra0: authenticated
[139400.725863] ra0: associate with AP 00:16:b6:cf:5e:be
[139400.728056] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[139400.728061] ra0: associated
[140189.181448] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[140189.181458] ra0: deauthenticated
[140189.182505] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[140189.215427] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[140189.265071] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[140189.300379] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[140189.363805] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[140189.457806] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[140189.528433] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[140190.526623] ra0: authenticate with AP 00:16:b6:cf:5e:be
[140190.529209] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[140190.529216] ra0: replying to auth challenge
[140190.534594] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[140190.534610] ra0: authenticated
[140190.534615] ra0: associate with AP 00:16:b6:cf:5e:be
[140190.536786] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[140190.536793] ra0: associated
[141028.622873] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[141028.622883] ra0: deauthenticated
[141028.641928] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[141028.649567] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[141028.665078] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[141028.688567] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[141028.751025] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[141028.762716] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[141029.760915] ra0: authenticate with AP 00:16:b6:cf:5e:be
[141029.763489] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[141029.763496] ra0: replying to auth challenge
[141029.770649] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[141029.770654] ra0: authenticated
[141029.770659] ra0: associate with AP 00:16:b6:cf:5e:be
[141029.774312] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[141029.774317] ra0: associated
[141868.065006] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[141868.065015] ra0: deauthenticated
[141869.063167] ra0: authenticate with AP 00:16:b6:cf:5e:be
[141869.065724] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[141869.065731] ra0: replying to auth challenge
[141869.068628] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[141869.068635] ra0: authenticated
[141869.068639] ra0: associate with AP 00:16:b6:cf:5e:be
[141869.070775] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[141869.070780] ra0: associated
[145285.793798] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[145285.793808] ra0: deauthenticated
[145286.791955] ra0: authenticate with AP 00:16:b6:cf:5e:be
[145286.794490] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[145286.794498] ra0: replying to auth challenge
[145286.797320] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[145286.797326] ra0: authenticated
[145286.797330] ra0: associate with AP 00:16:b6:cf:5e:be
[145286.799792] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[145286.799799] ra0: associated
[146005.408977] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[146005.408986] ra0: deauthenticated
[146006.405746] ra0: authenticate with AP 00:16:b6:cf:5e:be
[146006.408359] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[146006.408366] ra0: replying to auth challenge
[146006.420439] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[146006.420445] ra0: authenticated
[146006.420450] ra0: associate with AP 00:16:b6:cf:5e:be
[146006.428336] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[146006.428342] ra0: associated
[146305.116415] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[146305.116424] ra0: deauthenticated
[146306.114587] ra0: authenticate with AP 00:16:b6:cf:5e:be
[146306.117148] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[146306.117157] ra0: replying to auth challenge
[146306.122103] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[146306.122109] ra0: authenticated
[146306.122114] ra0: associate with AP 00:16:b6:cf:5e:be
[146306.125423] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[146306.125429] ra0: associated
[149123.246189] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[149123.246198] ra0: deauthenticated
[149123.258588] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[149123.265175] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[149123.279518] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[149123.292215] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[149123.293733] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[149123.501144] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[149123.530654] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[149124.529637] ra0: authenticate with AP 00:16:b6:cf:5e:be
[149124.532575] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[149124.532582] ra0: replying to auth challenge
[149124.535846] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[149124.535852] ra0: authenticated
[149124.535856] ra0: associate with AP 00:16:b6:cf:5e:be
[149124.545269] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[149124.545277] ra0: associated
[150082.606212] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[150082.606221] ra0: deauthenticated
[150083.604304] ra0: authenticate with AP 00:16:b6:cf:5e:be
[150083.606840] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[150083.606847] ra0: replying to auth challenge
[150083.609855] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[150083.609861] ra0: authenticated
[150083.609865] ra0: associate with AP 00:16:b6:cf:5e:be
[150083.612010] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[150083.612015] ra0: associated
[153620.255316] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[153620.255325] ra0: deauthenticated
[153620.270979] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[153620.319085] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[153620.343384] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[153620.346177] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[153620.434222] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[153620.440580] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[153621.437278] ra0: authenticate with AP 00:16:b6:cf:5e:be
[153621.440044] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[153621.440050] ra0: replying to auth challenge
[153621.447703] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[153621.447710] ra0: authenticated
[153621.447715] ra0: associate with AP 00:16:b6:cf:5e:be
[153621.464072] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[153621.464077] ra0: associated
[155836.785289] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[155836.785299] ra0: deauthenticated
[155837.784439] ra0: authenticate with AP 00:16:b6:cf:5e:be
[155837.786976] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[155837.786984] ra0: replying to auth challenge
[155837.793046] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[155837.793053] ra0: authenticated
[155837.793058] ra0: associate with AP 00:16:b6:cf:5e:be
[155837.802348] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[155837.802356] ra0: associated
[155906.745539] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[155906.745548] ra0: deauthenticated
[155907.741963] ra0: authenticate with AP 00:16:b6:cf:5e:be
[155907.745122] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[155907.745128] ra0: replying to auth challenge
[155907.748426] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[155907.748432] ra0: authenticated
[155907.748436] ra0: associate with AP 00:16:b6:cf:5e:be
[155907.750604] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[155907.750609] ra0: associated
[155966.697748] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[155966.697758] ra0: deauthenticated
[155967.694101] ra0: authenticate with AP 00:16:b6:cf:5e:be
[155967.699336] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[155967.699346] ra0: replying to auth challenge
[155967.710419] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[155967.710426] ra0: authenticated
[155967.710430] ra0: associate with AP 00:16:b6:cf:5e:be
[155967.718180] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[155967.718186] ra0: associated
[158498.014487] ra0: RX deauthentication from 00:16:b6:cf:5e:be (reason=7)
[158498.014535] ra0: deauthenticated
[158499.011942] ra0: authenticate with AP 00:16:b6:cf:5e:be
[158499.014402] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[158499.014408] ra0: replying to auth challenge
[158499.017284] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[158499.017291] ra0: authenticated
[158499.017295] ra0: associate with AP 00:16:b6:cf:5e:be
[158499.019656] ra0: RX ReassocResp from 00:16:b6:cf:5e:be (capab=0x411 
status=0 aid=1)
[158499.019661] ra0: associated
[159289.015075] ra0: No ProbeResp from current AP 00:16:b6:cf:5e:be - assume 
out of range
[159289.858553] ra0: No STA entry for own AP 00:16:b6:cf:5e:be
[159295.594744] ra0: No STA entry for own AP 00:16:b6:cf:5e:be
[159301.334931] ra0: No STA entry for own AP 00:16:b6:cf:5e:be
[159307.075102] ra0: No STA entry for own AP 00:16:b6:cf:5e:be
[159311.030089] ADDRCONF(NETDEV_CHANGE): ra0: link becomes ready
[159311.141483] ADDRCONF(NETDEV_UP): ra0: link is not ready
[159394.417693] ADDRCONF(NETDEV_UP): ra0: link is not ready
[164442.295162] ra0: Initial auth_alg=1
[164442.295171] ra0: authenticate with AP 00:16:b6:cf:5e:be
[164442.297684] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=2 status=0)
[164442.297693] ra0: replying to auth challenge
[164442.300690] ra0: RX authentication from 00:16:b6:cf:5e:be (alg=1 
transaction=4 status=0)
[164442.300697] ra0: authenticated
[164442.300701] ra0: associate with AP 00:16:b6:cf:5e:be
[164442.302760] ra0: RX AssocResp from 00:16:b6:cf:5e:be (capab=0x411 status=0 
aid=1)
[164442.302767] ra0: associated
[164442.306858] ADDRCONF(NETDEV_CHANGE): ra0: link becomes ready

-- 
nm-applet disconnects after irregular intervals
https://bugs.launchpad.net/bugs/150180
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