Comment 152 for bug 414560

I have the same problem with RaLink (04:00.0 Network controller: RaLink RT2860) on Kubuntu Karmic (WPA-PSK). Sometimes connection lost with this lines in syslog:

2009-11-24 19:41:31 rusart-laptop NetworkManager <info> (ra0): device state change: 8 -> 3 (reason 11)
2009-11-24 19:41:31 rusart-laptop NetworkManager <info> (ra0): deactivating device (reason: 11).
2009-11-24 19:41:31 rusart-laptop NetworkManager <info> (ra0): canceled DHCP transaction, dhcp client pid 25869
2009-11-24 19:41:31 rusart-laptop NetworkManager <WARN> check_one_route(): (ra0) error -34 returned from rtnl_route_del(): Sucess#012
2009-11-24 19:41:31 rusart-laptop NetworkManager <info> (ra0): removing resolv.conf from /sbin/resolvconf
2009-11-24 19:41:31 rusart-laptop avahi-daemon[816] Withdrawing address record for 192.168.0.100 on ra0.
2009-11-24 19:41:31 rusart-laptop avahi-daemon[816] Leaving mDNS multicast group on interface ra0.IPv4 with address 192.168.0.100.
2009-11-24 19:41:31 rusart-laptop avahi-daemon[816] Interface ra0.IPv4 no longer relevant for mDNS.
2009-11-24 19:41:31 rusart-laptop avahi-daemon[816] querier.c: querier_remove() called but no querier to remove.
2009-11-24 19:41:31 rusart-laptop avahi-daemon[816] last message repeated 9 times
2009-11-24 19:41:31 rusart-laptop NetworkManager <info> Activation (ra0) starting connection 'exogenesis'

Only one way to reconnect is deactivate wireless and activate it again. Else there is requests for WPA keyphrase with no results.

P.S. Sorry for my english...