V5 motor/wire issue

We recently ran into a problem with our wires when they started blinking red when plugged into one motor but if the wire was switched to a different motor it would work fine. Also if we put a differnt cord on the motor it was blinking on it would still blink but work with other motors. The motor we are having these issues on is a brand new motor , and it has happened to us many times before. Any suggestions.