[KingRandy]

We had that problem last year and it was caused by a pinched bearing. Double check your bearings as well as your spacers (Spacers were too tight for us). Also you may need to calibrate your motor controllers. Based on our controllers (Vex Victors)... you need to push the small pin near the heat sink until the lights start flashing (red or green I believe) and then drive Up 5 seconds, down 5 seconds, right 5 seconds and left 5 seconds. Hoped that helped, PM me if you need further assistance.