So, we built a BB8 style droid last night. I strongly encouraged getting the R2 style because it looked sturdier but kid went with BB style. It’s very cool the way the head rolls around on the ball vase. But the head frequently falls off, banging to the ground. Today (less than 12 hrs after purchase), he’s having all kinds of problems with it. The motor needs to constantly be opened up and re-set- I mean like every single time he goes to use it. If he doesn’t open the shell and re-set the motor, it doesn’t work at all. Of course, we left this morning and are now 3+ hours away. Suggestions?