There were a few older threads dealing with this but thought I'd start a fresh one. My Polaris (yes, the same one that wouldn't stay underwater) also decided that its wheels didn't need to turn anymore. Brand new. A few weeks ago I noticed the supply hose to it had become clogged with littles needles that like to come off the tree this time of years. Cleaned the filter on the supply line where it attached to the pool. Problem solved, for a day. Clogged up again. Lots of little needles. This time removed the filter screen. Yes, brainy, I know but problem solved.
Unilt recently when the Polaris quit moving again. It another thread someone said they had to blow out a tiny little hole where water was fed to the impeller. I managed to dissassemble mine, saw that hole and could see it was jammed up with, you guessed it, little needles. Poked it clean with a nail. Problem solved. For now.