Controller disconnected but but robot still worked(idk how to explain)

basically, i’m at this competition and during my quarter-final match my alliances controller disconnected but the controller was still connected to the radio and the radio was still connected to the brain. it’s seemed like they were disconnected manually, but that just our theory. can anyone explain this??

So if I’m understanding this correctly, the controller was plugged in to the circuit board looking thing and that was broadcasting to the brain. Is that what you were saying? Did the controller disconnect mid-game or was it not able to connect from the beginning?