Panasonic Combination Microwave (Boltby YO7)

Model NN-CF778S. Flatbed combination inverter microwave with drop down door. Clean inside. Fully working. Issues - 1. there are 2 drips of milk between the two sets of glass on the door. 2. Occasionally the microwave immediately switches off when it has been set. My answer has been to push on the top right of the door for a few seconds and then it works perfectly. Comes with Pyrex glass tray, rack and instruction book.