Thanks, DrGeoff, next time I will try that. But I suspect that it is the Internet connection that is failing. The way I discover that the lines are disconnected is when I try to dial a number I get a busy signal and then a voice that says "there are no connections..." or something like that.
I realize there is not a lot of info to go but my Obi202 is plugged into an AT&T Uverse 2Wire modem, model 3800HGV. Our landline also comes from them thru this router. I have a Panasonic DECT system plugged into the Obi202 for our GV calls, and a separate, older Uniden cordless system plugged into the 2Wire modem to directly access the landline.
What that does is give us two separate phones with different rings for the different lines. That is important to us since we give our GV number out as our only number so any calls coming directly to our landline are spammy calls that get that number from the public phone access records. Any calls that come in on that phone we let go to the answering machine but most never leave a message.
So a little background into our environment, probably not too different from most. Our Internet is a high speed Uverse connection that has been quite reliable over the last 4 years.