You have had electrical problems but have you thought about power
issues, utility surges, lightning, improper wiring. Utility surge nocked
out some equipment once, lightning Ive been through that 3 times, maybe
4. it can be distant and selective. Improper wiring like floating
neutral, improper ground, or reversed polarity. If you had a complete
recorded record of power supplied to your house you would find many
incidents that can ruin electronics, especialy during storms. Whole
house surge suppresion and verifying proper ground are a good place to
start.