I had the same situation with my 2003 Winnebago. After much homework, the issue is a short in the touch pad. Samsung is no longer making parts for this microwave. That said there are a ton of new old stock parts out there. I go a hold of the Samsung parts department got the last part number issued for my microwave. With that part number I went on the hunt and found a NOS part on ebay still in original packaging. I changed the touch pad out myself pretty easy and put the microwave back in. That said we still make sure to just flip the microwave breaker off when we are not using it. This is a pain, but every RV microwave that will fit in the cabinet is smaller by a fair amount, so we are going to keep what we have.