Coincidences do happen - your ride-on mower was probably one of those but the pattern of electrical problems you have experienced lately does suggest a common fault with your supply.
Could be your house is receiving power surges and maybe you haven't enough surge protection. Perhaps your system ground isn't very good.

One woman that posted here a few months ago was wondering why certain electronics kept breaking. It turned out a gas pipe wasn't grounded and gas flowing through the pipe caused a static electricity charge to build in the pipe until it jumped to whatever was nearby.

You need to consider almost everything these days contains a computer of some sort and so breaks much easier than older appliances, though in fairness appliances today do have a built-in limited life.