I've been trying to figure this out... Its been about 3 to 4 weeks since I've used any kind of epoxy and even then it was to fill a crack in a PVC line so I don't think it could be that...? Since it's an external model, I had it plumbed to be feed from the overflow so, in case somehow it was surging from an air build up in the feed line, I ran it with the skimmer pump off but with water flowing through it and the flooding stopped but soon as I turned on the pump, the flooding was happening again and I noticed that when it was flooding, no water was coming out of the return. I re-plumbed it T-ing from the return pump anyways and with the skimmer pump off, I didn't see any flooding but with then with the skimmer pump on, the flooding occurred again after a few minutes of running. So I turned everything on and pinched the tube taking air from the silencer to the pump and that caused the bubble level to drop and then when I released, it flooded within a minute or so. Tomorrow I'll check if there is some kind of clogging going on with the air lines and replace the soft tubing.