I have the 165, which is similar but designed for bigger pools, and it was always hit-or-miss for me.

I found it simply kept winding up the hose. The problem is that the water is supposed to cause the mechanism to feed the jets propulsion water in a set, programmed fashion that most of the time will undo every tangle it creates. Meanwhile, the actual cleaner mechanism, on the floor of the pool is merely a constant jet of water blow detritus into the catch bag. Its movements are totally random and directed by the surface engine.

So....if the mechanism builds up a touch of scaling on any part of its cams, it may prevent a jet from being opened, being opened long enough, or being open too long. In my case, since the unit was still under warranty, Polaris sent me a new insides for the upper mechanism. It looks like a giant clear plastic insect with 4 legs--and there's not much else to the floater besides the case.

It was an easy swap and it worked pretty well after that. However, I made the plunge several years ago to a robotic cleaner and never looked back. I struggled with a Dolphin, which worked great for 2 years then stopped working. The new one they sent me worked for a few months. I sold it and bought a Blue Diamond and it has been super-reliable....

Robotics like Aquabot, B/D, Dolphin and others scrub even vertical walls, so I haven't brushed my pool in several years.