Have a new pool installed and on the sundeck there are two rotating eyeball returns like in the picture below. One keeps getting stuck every so often and doesn’t spin. I read that sometimes pressure can be too low and they won’t spin freely but it feels the same on all returns. Filter pressure is the same it’s always been but maybe it’s time for a backwash (I’ve read that low return pressure is a sign of a dirty filter too and not just a bump in filter pressure). I unscrewed it and it’ll all clean from debris and so is the return hole so I’m not sure why it keeps doing that. Doesn’t affect anything but just bothers me it keeps getting stuck, especially when vertical because the water jet disturbs the surface. Any thoughts?