When I start heating something in my Kenmore elite microwave, it will sometimes change the minutes to 405 minutes. Yesterday, while I was using it to heat for an extended period of time (over 10 minutes) the fan started on it's own, the light came on and the time on the microwave changed. Is there something I can do to reset it, or do I need a service call?

Thanks in advance.

Forrest, January 2011