The good news is that toaster is back (at least temporarily and possibly permanently)!

If you could please answer some questions that might help with your sync problems:
Are you connected to a CO or RT and what is your distance?
What speed package do you have?
Can you post a copy of your line stats from the 2Wire while connected during the daytime and then a copy while the modem is struggling to maintain sync?
Bridged taps are not made when there is new construction, but when a stub on a loop is disconnected without cutting back to the cable trunk or a stub is added to a loop, so unless a party line customer or a wiretap on your phone loop has just been removed, there wouldn't be any new bridged taps. Now that DSL is here, I think SBC is more careful about not creating any new bridged taps and those that are found have been there for years.