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this is not a good thing, most appliance service companies have a microwave leak tester, i would call and have this looked at before using it any further, there are definitely microwaves escaping the cavity of the microwave.
I have had a applicance tech come to look at the unit and he say all batteries will get hot
if they are in front of the microwave. He says nothing is wrong with the unit. He charged me $75 for the visit.