[grock]

try deleting your phone drivers, disconnect phone, then disconnect/disable your internet, then plug your phone back in... when it asks to install drivers, browse to the Programs/HTC/drivers folder and select the appropriate driver for your version of W7.. if your finding that it still breaks after a few uses, my guess is its something to do with sync not being fully compatible with thunderbird... my $0.02 but its only worth 1/2 a penny compared to the rest of the talent here.