Lions562000

Why does my hot tub just shut off. There is no power to the lights or the pump or the heater. When i check the power it is there but nothing works. I think it has to do with the magnetic door switch. I have tried different magnets. But i think its the switch and not the magnet. It will run for a while then all of a sudden it just stops working. Then hours later it works just fine again. Everything powers back up like nothing ever happened. Its not the timer and it doesnt blow any breakers. Any ideas before i bypass the magnet.