It seems to me that you have had more than your share of problems with electronic devices. Power surges can cause them to fail prematurely, and they may also behave strangely.
My daughter lived in a nearly new apartment building located near a factory. At the same time each weekday evening, her stereo system would turn itself on. What caused it? A huge power surge in the lines at the end of the factory shift each day.
Have you considered checking your home's wiring? Perhaps an inexpensive whole-house surge protector would be a better buy than an extended warranty! At between $50 and $500, it's cheap insurance.