Customer reported that the dishwasher completes the cycle no problem. However she cant select another program without switching the mains supply off at the plug. The program has finished the display goes blank and the display will not come back on using the on/off switch on the appliance. Switch the appliance off at the socket switch it back on and all is well, even the on/off switch works controlling the display. Anybody have clues for this? I suspect the main control panel but would welcome advise.