So, I’ve noticed a few times when i’m spectating myself… as Mercy, i use one of the ‘special’ abilities from the traits we get to choose from. The Manual ones specifically. Upon doing so, Overwatch client kicks me back to the main menu.
EDIT: Everyone works fine for me but when Mercy is into the fold, the game disconnects roughly 95% of the time during replay.
It may be a coincidence but it’s worth investigating via using abilities and then checking replay, and then the time stamp to where your character uses them.