VEX EDR V5 Motors

Our robot is using 18:1 200 rpm motors. When first testing, they operated at full speed. Now they are going extremely slow and we cannot figure out why. We are not programming for autonomous, but just programming our controller. We have tried replacing the motors, replacing the brain, trying different gear ratios etc. All firmware is up to date and everything is fully charged. Our motors stopped going full speed over night and we can’t figure out why!

Where are these being used and have you tested the motors out of the robot?

the motors that aren’t going full speed are just arm motors and not part of our drive train. and yes we’ve tested the motors outside the robot…