This happened to me, but with the bedroom electricity. The lights and the receptacles went out and I could not reset it so I replaced the GFCI because it would not reset either. Then I noticed the MW was going out at the same time. I eventually got to replacing the 15a/20a combo breaker which had the bedroom 15amp circuit and the 20 amp MW circuit. I originally thought it was a bad GFCI and replaced it and the circuit working again was a coincidence, because I realized that it should not have affected the MW. The common denominator being the combo breaker got me to replace circuit breaker in the power panel. Problem solved. I still have the original GFCI because I don't think there was anything wrong with it and one of these days I will test it.
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