Mag 5 will not restart?

I have a mag 5 running two reactors one with carbon one with gfo. When turn the pump off to change out media it will not restart unless I lift it out of the water to get suction. I have a mag 9 for my return and it starts every time with out a problem.
 
I had that problem and the face of it cracked where the intake is and it got the impeller stuck do you feel any type of vibration when powered up
 
have you tried opening it up and checking inside? maybe you need to clean it out.

I cleaned it and everything seamed to be ok. This thing is brand new I have only used it for 2 weeks. I no it has enough power to push through two reactors because I used it too do a water change and it pumped the water almost 30' from my garage with no problem.
 
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