We bought a microwave May 26, 2018. For the second time in less than a year it completely lost power - no lights, fan, nothing. It comes back on intermittently. The person at the manufacturer Whirlpool/Maytag ('Raj' I think) was totally useless; couldn't even find the records for the purchase. I called back to talk to someone else, but she brushed me off, telling me I am "out of warranty". I specifically purchased a 5 year extended warranty because it was a floor model. I called the store but they tell me to call the manufacturer. I spoke to someone at the store's Customer Service who identified herself as "Erica". She was abrupt and unfriendly, didn't care in the slightest that giving me a date for a service call that left us without the use of microwave and exhaust fan for a full week away was a major problem. Couldn't tell me if it would be am or pm, just sometime between 8am and 4:30pm. Wouldn't let me know who the service company I would be dealing with was.
I bought a lousy product (Maytag) from a lousy store (The Brick).
Actually, Maytag makes some pretty nice microwaves. I wouldn't hesitate to recommend them.
What's the actual model you seem to be running into problems with?