Pentair Whisperflo just quit......any advice?

[cruzmisl]

Hmm, took the pump apart (separated motor from pump housing), everything appeared to be in order. I assembled it back together and now it works......what's up with that???

[Poconos]

First thought would be when it got hot something opened up and it was sucking air and could not sustain prime. All it takes is a hairline crack or opening to let enough air in to mess things up. Other that that....who knows.
Al