Client tabbing game out

I was in loading screen when and all of a sudden i kept getting tabbed out with the client coming upfront of my other windows, i closed off all background apps except for discord and it kept tabbing me out. when i finally closed off the background client while in loading screen it stopped tabbing me out. could someone take a look at this? I know that would be the temporary fix for it but once the match finishes i can't go back to the end game lobby, i have to re-open the client and check my stats through match history. I would like to be able to honor or report someone, and chat with allies or enemies after a match.