https://bugs.winehq.org/show_bug.cgi?id=41599
baysaa@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |baysaa@gmail.com
--- Comment #9 from baysaa@gmail.com --- Ubuntu 16.04.1 LTS Wine 1.9.15
Workaround (works for me currently): Go to Battle.net app's settings, then go to "Sound & Notifications". I unchecked all checkboxes and set the selects to "None" in the "Play a sound" column. This fixed the issue for me.