TV, Monitor reset periodically
How often is this happening? If it is happening frequently enough, I'd turn off some of the circuit breakers and see if something on one of them is causing the issue.

Call your utility company. A few years ago I was having a power quality issue in an apartment that would cause my computer and network UPS's to click on and back off momentarily every 20-60 minutes. Since it was a new issue and nothing had changed in the apartment, I called the utility company. They suggested LED lighting could be affecting the power but I said I hadn't installed any recently. They ended up attaching a power quality analyzer to diagnose the issue and they were able to fix it. I never heard what the issue ended up being, but it wasn't just my apartment. It was just such a subtle one that no one else had detected it and reported it.