Century B855 pool Pump won't keep prime

With the leaves and all of the extra debris that ends up in the pool I decided to clean my filter grids today. After I finished cleaning them I went to turn the pump back on. It would start to circulate and run normally after about 30 seconds it would lose prime and almost be struggling for air. I checked the motor to see if I could spin the impeller and it spun freely.

I did check and my Hayward 4820 is full of water and the pool skimmers and drain are free from debris.
 
Last night I checked the water level, skimmer doors, and made sure that my O-rings were adequate. I turned the pump on this morning and it seemed to be working correctly with no obstruction visible in the skimmer basket before the pool pump. Any clue what might have happened?
 
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