Microwave does not work

Owned for 20 years performed excelently problems none until recently Present problems it appears that the logic board has to be replaced. The unit was on and just stopped/ I replaced the fuse with an original GE fuse and it worked well for a couple of weeks. Last evening I was warming something up and it just stopped. I thought the fuse had gone again so I started to unscrew the to top grate and it stared to work again. I reset the information and completed the warmup. This morning I went to defrost something and after putting the item in the microwave and inputing the time, I closed the door and it just turned off. After about a minute the original welcome screen came on and asked to set up the time, AM/PM, time day and date. i did, it started to work, I then opened the door and it stopped. Hence I believe it is the logic board.