I suspect you had air trapped in the filter. When the pump shut down, the compressed air in the filter pushed back, turned the pump backwards, and unscrewed the impeller off the motor shaft. This particular pump doesn't use an impeller screw which prevents this from happening. You will have to pull the pump apart to see if this is the cause. I have seen this happen many times.
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What is the pressure reading on the filter pressure gauge with the pump off and then with the pump on? The water rushing back to your skimmer suggests the filter is clogged or a valve is broken and stuck closed somewhere.
John
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