GE mirowave spacemaker runs for 2 -3 seconds and... My JVM1650CH012 does the same thing it runs

Question

My JVM1650CH012 does the same thing it runs for about three seconds and then stops. The display becomes garbled and the clock/calender has to be entered. Reset clock/calendar. Unplugged the unit for 30 seconds and then re-tried with same results above. It appears to shut down 2 seconds after the cooking time begins countdown.
What is the solution, I have seen similar and identical problems but never a solution. Is there and interanl thermostat or fuse that needs replaced and is the cost of this prohibitive. The unit is 3 years old.
HELP!