Mine was doing the same thing. I already replaced the unit but as I was about to throw it out I decided I would open it up and look for something obvious.
When I inserted a disk I saw that it did not spin up. I gave it a nudge and it started to spin slowly. I worked it back and forth a bit and it came up to full speed and the disk started to play normally. I would imagine cheap bearings or dirt somewhere. I don't know how long it will last, but it will give me a spare for my camper.
Good luck!
