I've experienced the same problem with my GE SpaceSaver and I think I've isolated it to an interior paint chip. The paint acts as isolator from the walls. Not certain how it became chipped, but I'll assume it was company I had that was always removing the metal shelf.
Anyhow I placed a large glass coffe mug filled with water in front of the chipped area along with another cup filled with water too and turned the Microwave on again. The oven does not fail.
If you don't 'spot' any paint chip then this is not your problem - sorry I wasted your time.
Good Luck!
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