Hey Guys, new member here, I am having a strange issue and hope someone can help. I have a 25k gallon pool with a sand filter, everything appears to run fine when there is NO pool vac attached, i am currently using a kreepy krauly, about 6 months old. The gauge on the top of my filter reads 10psi, the skimmer has a lot of suction, the returns blow out strong. If i attach my Kreepy Krauly he runs like a bat out of **** for about 10 minutes, then out of nowhere it will slowly come to a stop. At that point the gauge at the top of my filter reads 20 psi and there is 0 flow in and out of the pool. There is no debri in the bottom of my pool, my catch baskets are clean, I just pulled almost all of the sand out of my drum(currently running it like this) to see if there was some blockage in there but nothing is visible. If i backwash it for honestly 5 seconds it returns to normal, permanently until i attach my vac again, any ideas?