AT&T claims the reason their router, the BGW320-500 sometimes factory resets itself is because it’s designed to do this in response to unexpected power loss, and if the house didn’t lose power, the power strip / surge protector may be at fault.
Which I don’t doubt might be the case, I have old, cheap, generic power strip.
So recommend me a power / strip protector you trust with your uptime. While I don’t need a UPS, I wouldn’t mind /some/ battery backup to smooth over brief power issues.
Yes, we went over this point multiple times, including the distinction between a reboot and a factory reset. He said the device does this to “protect itself”. Although I only care about protecting from blips, I think a small UPS may be the way to go. Though guess that means if the power is out for more than 15 minutes, my AT&T modem may still factory reset itself!