With kernel 3.0
Linux deb001 3.0.0-1-amd64 #1 SMP Sat Aug 27 16:21:11 UTC 2011 x86_64 GNU/Linux
it keeps the same, not working ok yet.
Same issue, starts working but suddenly it fails, and modprobe -r ath9k doesn't fix it.
If I can contribute with something to help.