I think the motor breaks in rare cases. A month ago the motor controller on my printer was broken. So I had to replace the IC. As you can see on the picture, a part of the IC was burnt out.
When you open the top of your printer there is a small PCB with some connectors and the motor controller. Take a look if you can see anything that looks broken. If your motor controller IC looks like mine, send a message to flux. They can send you a new PCP or repair your old one. If you have some soldering skills, you can replace the IC by yourself. But first, look if it's really the same issue I had.