You might want to call an electrician, or at least a techie friend, and check the voltage at your home. Actually, I think our electric coop will do that for free, at least at the meter, so you might call your electric company. If you have not noticed power fluctuations as mentioned above (dimming or brightening lights, brief outages and clocks reset, etc.) you do not know if the power is good or bad.
An electrician or the power company may install a monitor that tracks the voltage (and current, depending on the monitor) for a few days to see if anything strange is happening.
If the problem is inside the house you may again need the services of an electrician to troubleshoot and fix. A UPS-type unit might help, but if there are really power issues you should find out what and why before other things start breaking down. I mistrust the idea of randomly adding surge protectors or anything else to see if that helps, especially given the troubles you've had.
Of course, it could all just be coincidence...
HTH - Don
"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley