Hello, this is all new to me, so sorry if the question seems dumb. I built a submarine with 5 motors. The front and back motors use a 4-in-1 ESC, and the 5th motor uses a 2-in-1 ESC. The front 2 motors and the 5th motor spin at the same time to go up and down.
Here is the issue: When I start using the back motors, for example, and then change to the front and 5th motor, and then again to the back motor, one of the motors stops spinning and makes a high-pitched sound. The same thing can happen to the front motors. This never happens with the 5th motor (2-in-1 ESC). Whenever one of the motors stops spinning, I can give it a spin with my fingers, and it starts working normally again. At first, I thought it was my motors, but it can happen to any of the 4 motors. On top of all that, they can randomly start spinning on their own, and then the whole thing shuts down.
Any ideas why this is happening?