I don't know if this is the right place, but anyway...
Since I downloaded 3.6.12 and the mediaVPs, I've been experiencing issues with the audio. To put it simply, the various audio sounds (guns, beams, etc) are intermittent at best. When I first start the game, it's not very noticeable but as each new mission is played, the problem becomes more and more acute. You'll hear the sound of a single shot after about 10-20 silent shots, beams with no sound, music taking a while to load between each track, etc.
I first noticed this with Blue Planet 2, and again with the recently released Wings of Dawn campaign.
I'm also getting these issues whether I have the "pre-load sounds" button in the launcher ticked or not.
Again, I'm not sure if this is the correct place, but I'd be grateful for any advice as to what the issue is, as I've never had this problem with any previous versions or builds.