Have a Polaris Alpha IQ+ robotic cleaner and recently the right side wheels and brush don't spin. It's just goes in a circle at this point. Had it 4 years so wondering if this is normal to die or can i replace a motor to keep it going? Any help is appreciated.

The IQ+ has a dual motor setup, so my guess is you've either stripped the gears or burned up a motor at 4 years old. I believe the motors are sold as a single "piece" so you would need to replace the entire motor and housing assembly if replacing with OEM components. Gears can be changed as individual pieces.

Not familiar with that specific model, but I've rebuilt mine a couple times in 5 years and feel it's now on borrowed time. Sounds like a stripped gear or burned out motor. I'd crack it open and see if you see any visible carnage and start from there. Parts are readily available on Amazon. They're fairly straight forward to work on and worth an attempt before dropping $$$ on a new unit.

God luck!