I have a microwave unit separate from my oven unit. After I replaced the microwave plate with a dinner plate (because it broke) the following happened after a few weeks: The micro wave suddenly did not heat anything, although the dials/buttons work and these buttons on a panel also direct the temperature, etc. of the oven below, which works fine. What could have caused the sudden loss of the micro waves ability to heat? By the way, these are "built ins which came with our home about 5 years ago. You help is appreciated
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