I have exact the same symptoms using the same wireless card: Netgear
WG311v3 with ndiswrapper.

I experienced no problems at all on feisty and hardy using wired
network. After moving my PC to another room, which forced me to buy and
use a wireless card, this bug started to occur randomly once or twice a
day. All the symptoms described by Alan are exactly the same on my
machine (terminal, nautilus etc. cannot be started until I restart
networking via Network Manager, then they catch up, error messages are
the same etc.)

I also noticed, that having a samba share(s) mounted causes this strange 
"deadlock" to occur more often. I can see additional error messages in the 
output if dmesg | tail then:
[  715.772180]  CIFS VFS: Error 0xffffff90 on cifs_get_inode_info in lookup of 
\.Trash-1000
[  725.749495]  CIFS VFS: Error 0xffffff90 on cifs_get_inode_info in lookup of 
\.Trash-1000
[  735.725806]  CIFS VFS: Error 0xffffff90 on cifs_get_inode_info in lookup of 
\.Trash-1000
and so on...

But without samba shares mounted it happens as well, with only these error 
messages:
[ 1910.717822] ndiswrapper (set_scan:1212): scanning failed (C0000001)
[ 1910.967641] ndiswrapper (set_essid:59): setting essid failed (C0000001)
[ 1910.967650] ndiswrapper (set_infra_mode:149): getting operating mode to 
failed (C0000001)

On my laptop, which uses another wireless card with linux native driver
I don't have any problems with networking.

-- 
Netgear WG311v3 causes ndiswrapper socket deadlock
https://bugs.launchpad.net/bugs/227033
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