i HAVE JUST PURCHASED A 1989 CALIFORNIAN THAT HAS A SHARP MICROWAVE OVEN. WAS WORKING PERFECTLY UNTIL RECENTLY. THE UNIT SHUTS DOWN AS SOON AS THE ROTATE STARTS. THE POWER THEN RESETS BUT HAVE THE SAME ISSUE WHEN HITTING THE START BUTTON ON THE KEY PAD. ANYONE HAVE THE SAME ISSUE? WHAT WAS THE FIX?