Modem/router problem

[ppppenguin]

Doesn't look like the power supply. Web server was OK when restarted but has already crashed, less than 40 minutes later. Otherwise the modem/router is still working OK. It's giving internat access, both wired and wifi, it's pingable.

I suppose I should try a factory reset and then reconfigure it. I doubt it will help but it would be silly not to try.