These bugs are probably related 
https://bugs.launchpad.net/ubuntu/+source/linux-backports-modules-2.6.28/+bug/372885
 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/488909
I suffer from this bug, too. At some time connection is lost, NM icon continue 
displaying the last status, but I have to reboot
Attached is my whole dmesg (at line 830 the problem starts)
I'm on 10.04, kernel is 2.6.32-24-generic

It seems a firmeware (or kernel module) problem specific to this chip
(my card is a dlink usb adapter)

** Attachment added: "rt2x00usb-error.txt"
   http://launchpadlibrarian.net/52815685/rt2x00usb-error.txt

-- 
rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x308c 
with error -71.
https://bugs.launchpad.net/bugs/362875
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