I've experienced behavior matching the description in Vinh's bug link: Connectivity usually works fine, but on one or two occasions that I was somewhere that there were many wireless access points, first I got a long list, then got nothing, or if there was something on the list I couldn't connect to it. Maybe I'll be able to run syslog (per the bug link) at some point. On my 770 I've been running OS 3.2006.49-2 forever.