My Thinkpad T420 with a Thinkpenguin wifi usb dongle was experiencing the same flakiness as tdlnx a couple of months ago, but I did two things that appear to have cured the problem: (1) Unplug the dongle from the USB port and plug it in again a few times to clean off the contacts; and (2) Re-orient the antenna on the router. My connection went from 6kb/s to around 60kb/s, which isn't lightning fast but is acceptable for web browsing and for keeping my Trisquel 7 installation up to date. It doesn't lose connectivity any more, either.

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