Dad and I installed a new Polaris PB4-60 pump at his equipment pad less than a year ago; in the past few weeks, he's had a couple instances of the pump failing to power on, only to come on just fine perhaps the next day or in one case not until three or four days later. I know the motor isn't seized. I was thinking maybe a poor connection somewhere, water in an electrical box or some other sort of issue that might come and go. Just yesterday he finally clued me in that he does hear a humming from the motor when it would fail to come on, which to me indicates a possible capacitor issue. But my question is would it make sense to have a capacitor fail to start the motor one day only to work fine a day or two later, rather than failing outright? Or if not, what else would that indicate?