Panasonic Counter top Microwave model # NNT695SF Often when I push the start button, the microwave will go for a few seconds and then cut out. I then open the door and then shut the door and push the start button, and the same pattern happens. We bought the microwave two years ago and it worked perfectly for the first 18 months. The problem described above does NOT happen all of the time. It is hit and miss. Sometimes it happens as described above and sometimes it works just fine. thanks for your assistance, regards, glen