I have a Maytag Microwave over the counter oven MMV5208. About 2 years ago it stopped heating but everything else worked fine. I pulled the unit out couldn't see anything wrong and shoved it back in. Surprisingly it suddenly worked perfectly again and has worked for another 2 years. Last week the same thing happened again: Everything works but it doesn't heat! Is there a reset button that needs to be pressed. What's wrong with this unit. Why won't it heat when absolutely everything else works?