Got this for my son for his birthday. He drove it Saturday for about 5 minutes and it stripped the spur gear. Didn’t jump it or anything just normal back and forth. Pulled it apart and looked like the mesh wasn’t set right from factory. So I put a new one in that came in the box. This was nice never had another rc come with a spare guess there’s a reason for it. Anyway put the new one in set the mesh perfect has a weird setup with a cam with teeth to adjust the mesh. About 5 minutes in did the same thing spinning motor and not moving. It seems like the motor is not staying in place with this setup is there any trick to it? I called associated waiting for a call back.