I have a rena XP3 on my 125g. Yesterday I noticed something strange. When I put the top on (lid with motor etc.) It wasn't priming blowing water and air out. I took it apart and cleaned everything checked the gaskets. Put it back together and still the same. I unplugged it and it started overflowing. I took and lifted the lock lever, after cleaning the mess up. I noticed with the lever up it was fully primed and working correctly. After moving the lever up and down slowly it finally primed with the lever down and no leaking. Has anyone had this problem before?