Is this not a result of the recent auth issues?
http://www.thebuddyforum.com/demonbuddy-forum/77199-banwave.html
After a longer session the problem reappeared even with 1.6. At least I got a 7 hour session without interruptions.I had the same problem with 1.6.2, looks like this got fixed by downgrading Trinity to 1.6.0. Not sure what the problem is.