Microwave has been in use for about 3 weeks.  Has had a problem with not functioning due to poor door closure from day one.  Many times door needed to be reopened and closrd in order for microwave to function.  At times the timer for microwave functioning would run without any microwave function occuring.  Today the microwave function will not work despite numerous attempts to start it.  Even tried to unplug and restart with no change in performance.  Very disappointed in product as I have been a GE appliance purchaser for years.  This purchase has me questioning whether I will continue to be a GE customer.