Need Help With 393 Motor Issue

[Robo Hamsters]

Hello,

we need some troubleshooting help.

Our bot from last year has 2 Vex 393 motors (using the Vex motor controllers) and one HiTechnic servo (from KOP).

Until today all 3 were working, but as of today only the servo is working correctly. We tried replacing the 393 motors, we also tried replacing motor controllers for the 393's. We even tried swapping them to 2 unused PWM ports on our DSC. Nothing worked.

When we activate these motors the click and move very slowly until you give them a kick. Then they start working correctly.

Any suggestions as to what the problem may be?

TIA