I have recorded the issue on video, though in this match both the sound problem and the stuttering have been shorter and less frequent than other times. I've had matches with no sound for more than 4 seconds, and stuttering every minute. Frag grenades seem to reproduce this issue sometimes.
Here's a whole 35 minutes video where you can see the issue many times:
TIMESTAMPS there might be more, but I picked some at random.
4:24 | 7:45 | 9:33 | 11:14 | 16:56 | 24:16
15:17 | 0:52 | 27:13 | 26:51
Some firing flash through a wall: