My Kenmore Elite HD King size Catalyst Model#110.20056 991 started not allowing some of the wash, spin, or water level options to work. Then, at times, the control panel would go dead and after leaving it unplugged for half and hour and plugging it back in it would work fine. Finally today the control panel will display PF for a few minutes and then go dead. Is this a slow death of the circuit board or is this a common problem that can be fixed easily. Please help! Thank you!