Actually this is a genuine issue with the shear number of aircraft in the sky. Radio systems have issues with hidden transmitters, that is if you have two aircraft who both want to send a message at the same time but can't hear each other they both start transmitting, and a receiver in the middle hears both simultaneously and neither is intelligible. It's particularly bad with wifi, and now air traffic is getting the same problem.
As things get busy the problem is amplified by re-transmissions, additional messages due to equipment failures and warning conditions like low fuel, more and more aircraft joining parking areas waiting to land and so forth.
The system could do with an overhaul, but it's well established, works over long ranges and is relatively cheap.