@gruemscheli I wasn’t saying it IS the controller, I was just pointing out that more troubleshooting would be needed than just switching ports in order to rule it out, sorry if my previous wording caused confusion. The controller is a CAN bus. You can read about the basics of a CAN bus here. It was designed for cars but has since been adapted to other use cases. Personally I don’t think it’s the controller, I think it’s the head.