It sure sounds like something is stuck. Very basic system inside. When conditions get met, the car moves to the next point.
I bought one that was broken. I had to dismantle it, sand and lubricate the main wheel to get it to spin freely. It kept getting stuck.
All the switches inside worked great. Every once in a while it goes around silent, when power is applied. I believe it's from something out of sync. I also believe that what you're seeing!
