I just got my Maytronics Oasis Z5 running yesterday and within 5 minutes of being in the pool, it got stuck on one of the bottom grates. Anyone have a similar problem with the Z5 or another Maytronics product? Would anyone have a suggestion for a grate with a smaller stack height? I really don't want to return the unit, but also do not want to stand around watching to see if it hangs up either. Thank you for the help