We have had our PWB7030 for 3 months and all of sudden the clock disappears and won't let me reset clock again.   When I press clock button, turn dial button comes up and that is it.  Turn dial and nothing happens.  Then when I press microwave function, oven function comes up.   Can't unplug to reset since it is in a shelf in kitchen.   Love the microwave/oven but need to learn how to fix this.