said by prob_cust 
:said by Farchord :There's two reasons why a modem might reboot:
1- Bad firmware. It happened in my case, did an update, and it fixed it.
2- Something wrong with your power outlet? Maybe out of power?
3- Modem has a defect.
I don't think it's a connection problem, as the modem would just resync if the connection would give.
1. FW: 2Wire 4.25.19 (Is it good or bad? I do not know)
2. Power: I doubt it, as it is on UPS.
3. It could be, who knows... it was one of those used ones Canada Computers was selling for $20 some time ago.
On the 'resync' part: What does that exactly mean? Does it get new IP when 'resync' takes place? Would there be an internet disconnection during resync? Would one notice it? If one were using VoIP when resync happened, would the call be dropped? How often this 'resync' happens on a typical line?
1. I don't have that kind of modem, someone else might be better at telling you.
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Might not be it, but idk in this case.