I also have a Sharp microwave, model R1481, made in 1999. It starts by itself any time day or night. I have emailed the company with no response. I keep the door ajar as that seems to give me some piece of mind. It led pad is now giving me trouble by shutting itself off in the middle of a sequence. I was going to get a replacement but will look elsewhere. Sharp was a brand I thought was trustworthy. WRONG.