I'm having trouble when trying to vacuum the pool. I'm doing it the same way I've been doing it for the past few years, but suddenly the pump started losing its prime once the vacuum was used. I have removed and lubed the gaskets, but as long as the vacuum isn't attached, the pump runs fine. I don't have a "swivel end" to get mixed up which I read about in older threads, and there isn't anything lodged in the vacuum hose, plus the return flow appears to be ok. Both ends of the hose, the one attached to the vacuum head and the end attached to the skimmer (pool only has one skimmer) have cracks, but they're both under water all the time so can't be sucking air. Any ideas??? I'm preparing to put the house on the market and want the pool to look sparkling. Thanks for any suggestions. I'm stumped, and here come the leaves...