JVM2070SH001 Cuts Out after a few seconds!

When we bought our house back in 2005 it came installed with a GE Profile Spacemaker microwave oven (JVM2070SH001). A year later we started experiencing problems with it. In the middle of cooking it would simply shut itself off and would come back on prompting to reset the time. This would happen intermittently with no apparent pattern. We're very frustrated with this product and will definitely choose a different brand if we decide to replace it.

My last microwave lasted 20+ years and was working fine when I sold it with my last house 2 years ago!