The only fix is to turn the sound off (which is what I had to do) or to check and uncheck sound reverb, headphone, some others might work but those fix it for me, but I am not going to do that after every fight to try to play with the sound enabled.... Please fix, this has been a known issue since beta.
Get the Desktop App for Battle.net Now
- All your games in 1 place
- Log in once
- Automatic game updates