So after using my YN-E3-RT in a pro environment for a few weeks I have to say, it sucks. Mine has been unreliable, with regular loss of communication, remote misfires, and very touchy menu interface that only happens when the thing is mounted on a camera.
I now have to take it off camera to make any adjustments to remote or menu settings, once the thing drops a flash you have to go very close to reconnect.
The thing is a frustration, when it works it is fantastic, especially on pre 2012 bodies, when it doesn't, I just want to throw it away. It is not in the same league of reliability as the Canon ST-E3-RT that I also own.
That's unfortunate. Good thing you have the Canon transmitter.