I had this problem with a relatively weak signal.  NM would do it's
scanning for better networks and loose the connection in the process.

Two things fixed the problem for me:

(1) Use the windsurfer signal booster on my router
http://www.freeantennas.com/projects/template2/index.html

(2) Disable the roaming and configure the WiFi manually.

Since then connection is rock-solid.  Note that due to a bug I have to
re-enter the manual configuration after each reboot.

-- 
NM disconnect Wi-fi Lan after some time
https://bugs.launchpad.net/bugs/203442
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