I am not a Mercy Main, but I duo with one.
Does anyone, a mercy or not, notice that some of Mercy’s abilities are lagging? or playing as Mercy is causing you to get disconnected?
My Mercy duo is constantly lagging and getting disconnected from the game as a Mercy but if she switches to another character all the lag issues and disconnections stop.
The lag basically shows health bars, then other characters floating, then Mercy ends up somewhere else on the map, and then sometimes disconnects from the game. Its been happening for about the past two days.
I’ve had a few Mercys with varying hours into the game get disconnected from matches, or message about lag and switch characters and the issues disappear.
My guess would be this is somehow tied into the mythic skin issues still, like some sort of broken code from that skin but I only manage devs at work, I am not dev 
Issue is for sure on PC, idk about console