Just found this forum within the last couple of weeks and am very appreciative of all the great information!
I've got a small inground pool that is probably 10-15 years old - I've owned the house for 6 years now. The pool has a sand filter and a Polaris 280 cleaner. Within the last couple of weeks I purchased and installed a brand new Polaris booster pump (the old one wore out). Since then I have noticed on occasion the pool quits circulating.
The first time it happened (a day or two ago) I backwashed the pool and everything started right back up to normal operation.
Earlier this morning the pool was circulating fine. I turned on the Polaris pump and it ran for a few hours and cleaned the pool and I then turned it off. Within a few hours after turning off the cleaner (booster pump) I noticed the pool was no longer circulating. I turned off the pool pump, waited a minute to let the pressure settle, then turned it back on and everything started working fine again (I didn't backwash it because I had just backwashed it yesterday or day before so didn't think that would be the issue).
It may be coincidental, but I'm thinking it has something to do with running the Polaris booster pump. One additional thing I will test tomorrow is if the circulation dies when the cleaner is turned on. Until then I wanted to get this out there to see if anyone might have experienced this before or might have any feedback to offer.