XT9 restarts spontaneously?

[Fortissimo]

Once in a while our XT9 reboots.
The wired and wireless connections aren't working.
The led begins blinking green and finally becomes white again.

Autoreboot is enabled on Thursdays at 04:05.

Does anybody recognize this?

 

[bennor]

Have you looked at the logs to see if they provide a reason for the unexpected reboot/restart?

 

[Fortissimo]

I have, but don't know what to look for.

I have this, but I don't know if it's all correct.
I had to reboot the router as it didn't come up (or I thought it didn't)