I am also seeing something similar, no idea if it is the same thing. When using vpnc, Network-Manager frequently looses the connection. On one occasion it crashed (https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/302394) and once the applet in the systray disappeared the wireless connection became stable again. The wireless card is an IPW 4965 AG in a Lenovo Thinkpad T61p.
I am also seeing something similar, no idea if it is the same thing. When using vpnc, Network-Manager frequently looses the connection. On one occasion it crashed (https:/ /bugs.launchpad .net/ubuntu/ +source/ network- manager/ +bug/302394) and once the applet in the systray disappeared the wireless connection became stable again. The wireless card is an IPW 4965 AG in a Lenovo Thinkpad T61p.