Intermittant error codes appear while baking. F1 or F2 will show up with many beeps. At some point, OFF will show up on each oven, and it will be necessary to restart the oven or ovens. Problem has been present for several months, and is now getting worse so that baking is almost impossible because of the interruptions. When system does operate properly, all controls, clock and timers work properly. Only reasonable assumption is that there are gliches in the microprocessor.