I am also getting connection drops, usually around 20:00-22:00, had a few the other weekend at ~20:30 then ~21:30, and just had one now at 22:14.
Usually rock solid.
Maybe this is due to christmas all the people/houses with christmas lights between our phonelines and the exchange causing problems. The disconnections do seem rather random my router may make it 10 hours or 60 hours before disconnecting it's very random.