Recently ran into an issue that I thought was brown out related.
Turns out, it was on the models I had messed with the throws on.
If I altered the limits to 125% (max) and did something like punch throttle, plus full aileron, rudder, and elevator, it acts like about a 2 second brown out. This is probably causing some kind of radio error in the firmware and may depend on your subtrim settings.
It is the first setback I have experienced with the 9XR and I still love these radios.
The problem came up on my Inverza and Yak 54. No crash or damage, but I was boosting the throws all I could on those models. This issue went away when I set the throw back to 100%.