Microwave Comes on when Door is Opened. Here's a wierd one. Every time we open the door to the

Question

Here's a wierd one. Every time we open the door to the microwave, it comes "on". And this happens even when the timer has timed out. It's like there's a switch on the door that says "come on" when the door is opened. I don't see any mechanical switches on the door to reset. I've also opened the breaker to cut power off to the microwave in hopes that it would possibly reset a malfunctioning electronic control circuit; it didn't correct the problem.Any suggestions?