Help, my Panasonic NNA724M Combination Oven will no longer microwave. I can set the microwave going but after 20ish seconds the microwave stops and timer is replaced by the clock, without any audible warning. I've attempted to do numerous cycles at the 20ish seconds with a glass of water to see if the microwave is working at all but have had no success. It appears that although the timer does run for a limited time the microwave does not work, but I can not explain why the timer cancels after a short period. The oven & grill parts are still working correctly. Any help would be appreciated. Thanks.
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