My wife says that if she uses the microwave 3x in a row then on the third run it takes much longer to heat up the food than it should (all 3 runs are for 1-2 minutes each). I don't know if this is a ...

Over-the-range microwaves are built into the cabinetry and bolted to a wall, so replacing one that conks out is no simple chore. To avoid replacing yours more than about once every 10 years—which is ...