Will you please push on the door, while the oven is running, and let me know if it improves its operation?
pushing on the door did seem to help since when i started, paused and restarted several times it seemed to work ok. But later when i started a new cycle i experienced the same type problems.
The most likely cause of your problem is a door safety interlock switch that's misadjusted or worn out of operating specification. There is a switch for each latch hook, and it's usually best to replace them both. They're mounted on the latch assembly that's directly behind the latch hook slots in the door frame. To access it, you need to remove the oven cover wrap.
You can usually find the replacement switch at a good hardware store, but if you can't, go to www.repairclinic.com, enter your model number, and choose switches from the parts type list.