I had a very strange issue in a competition today. This is my 4th tournament with this exact robot, and this is the first time I have had issues with it. 2 of my V5 motors died in a rather peculiar way. Before 2 of my matches, (one of which was unfortunately finals) 2 motors randomly died despite passing a pre-match “systems check” to make sure everything works. They no longer move. They are not seized up, they spin freely. They just emit a high-pitched beeping noise when power is applied. I took apart one of my motors to verify that it was not anything mechanical, and when I isolated the motor/circuit board the problem persisted. I connected a 9V battery to the motor and the motor spun properly. The motors both came off of my drive and were not experiencing any abnormal stress. I am quite upset that this happened because (aside from costing me the tournament, but I can get over that) I can not be sure that this problem will not happen again. I want to figure out exactly what happened so that I can make sure none of my motors ever do this again.
I think it is worth noting that I am 95% sure that both motors were connected to the same port and wire on the V5 brain. Anyone have any advice or has experienced a similar issue?