Xfinity modem restarting every Monday

For the past month or so, every Monday between 1pm-2pm, my modem restarts itself like clockwork. It takes about 10 minutes before the internet comes back on, & I have no idea why it started doing this. I have had the same modem for a couple years, & havem't messed with or changed any settings.

I was thinking it was just the manual updates it regularly does, but when I searched to see if there was a way to change the time for that, I couldn't find anything.

I saw on the TV box it has a time you can change for updates, but not for the modem. Any idea what is causing this or how to change it/get it to stop?