Noticed today while vacuuming the brush head was sticking. Had this last year due to bristles being worn down. Turned the head over, and no bristles on two of the 3 sides! Vacuum head is new this season, so quite surprised. Really need the vacuum since it's been a constant battle trying to keep the algae at bay with the heat!! Has anyone else noticed a lot of wear on tear on their vacuum head this season? Didn't do anything different, but wondered if just by having it sit out in the heat did something to break it down faster??