It's happened in nearly every game I've played since the patch went live. It's like the sound is playing in slow motion. It seems to get worse (slower and more garbled) when there's more stuff going on (like when there's a Demon or in the last minute when tons of spells are being cast). There also seems to be lag when selecting and casting spells.
The audio is perfectly fine when I'm alone in a game but once my opponent enters, the problems start happening.