Started having this issue about a week ago. Got some weird audio tearing/robotic clipping sounds whenever I play Blizzard games. I've updated my card/audio drivers to the best of my knowledge. It doesn't lag me out on WoW but when I play Overwatch I can't do anything really and it drops my frames pretty wicked
Seems to be a recurring thing lately as far as WoW goes. A lot of people have reported similar things, myself included. Can't speak for Overwatch though.