I noticed this morning my pump dedicated to my in-floor system had lost its prime. I have done as much troubleshooting as possible but can't figure it out. It doesn't seem to be that it can't get prime, but that as soon as it does it loses it again and then cycles this way over and over again every 2 minutes or so. I don't think it a leak on the suction side because of the fact that it does catch prime each time. I have installed a new pump basket o-ring, as well as a new impeller diffuser o-ring.
Here's a brief video showing how it catches prime then immediately loses it.