Microwave oven turns off. This is a 2 1/2 year old oven, recently started to turn off while

Question

This is a 2 1/2 year old oven, recently started to turn off while working, sometimes it doesn't turn back on by itself so I have to disconnect/reconnect. I noticed that the wires get a bit warm when it stops working. Now takes like 5 times to reset in order to work. The oven is on its own 30 Amp breaker. What part could be causing this?Thanks for your help.