KitchenAid KHMS2050SSS Microwave Oven "kitchen aid communication error" Questions

...Fault codes for a number of KitchenAid appliances, including two and four digit codesfor ... F9 - Oven Door Lock Failure - Check door lock switches and

...Kitchen Aid convection microwave, with food warming, just quit for the second time. (it's a month old unit.) The error code that showed up on the digital screen was: "F6 E0 Communication Error". No ...