micro bubbles.
Steve,
If any pump is plumbed externally,it is probably getting air on the intake side of the pump...this was the case on a few that ive plumbed.(Teflon chincing ;) )
If it is in the sump,and no bubbles apparent where the pump sits,those anti siphons are the problem...(another that ive done).
I fixed them by placing the holes about 3/4" below water level,this way it will only siphon until water drops below this level,just make sure your sump can handle the extra capacity.. ;) .
Marc
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