Check the bearing but it sounds to me like the pump overheated and thermal switch is broken so it is switching on and off every minute or so. It could be that it is right at the point of overheat and cools and turns back on.
Thats what i was thinking,, but i took the pump out of the water fast and removed the impeller to feel i there was any heat in the chamber but it was very cool,,,,, i hope its not a dodge thermal sensor as this is in the sealed unit and i would say its unfixable !!
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