-------------My experience
When I am crouched+inscope and sometimes leaning with a winchester and scope, I randomly loose my breath with a grey screen flash and sway comes back.
This needs thorough testing as it is hard to reproduce.
It could be a "being supressed bug" when not hearing shots at me nor seeing anyone around me.
Server was 50/50, I had friends around me in a 1km radius, we was at NW airfield with other players around us.