That's not how it works... not even close.
Uses a small number of channels with frequency hopping and coded packets. Drones only pay attention to packets addressed to them.
The way it failed looks almost certainly like a controller failure...
My initial suspicion is a technical cause: simple and well understood RF interference. Effectively, mix a bunch of Tx-Rx together in a narrow band - we are talking 2000 radio pairs in very close proximity - intermodulation and loss of frequency...