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You're right! It's receiving sensor problem with your PCB. Only repairman who knows electronic tech could only repair. I could say the cost of repair in Indian Rupees IRS.850/- maximum. Hope it's helpful?
On the timer function, when you press the button, it will ask you the starting time and ending time of when the unit will start and turn off by itself. prior to use this function, the clock on the control has to be set.. On the sleep function, it will give you the option to turn off unit on 30 min. intervals. Just like on a TV.
The unit has a timer function and a Sleep timer function. Have you ensured both of these are not on?
If thy are off I would guess that either a button is bad and inducting a control signal to the controller or the controller itself is bad and just randomly is setting on and off times at random.