There are various and sundry sound bugs in the game since the "Season 5" update and the Dec. 15th patch.
I have noticed the bug you are referring to, however it seems intermittent for me -- or rather is obscured by other sound problems enough that it isn't always noticeable on its own.
References for other sound bugs:
http://forums.startrekonline.com/sho...d.php?t=242630
http://forums.startrekonline.com/sho...d.php?t=245521
Sadly, at least some of these issues were present and reported to the devs on the Tribble test shard long before deployment to the live shard.
The fact they remain unfixed and *worse*, actually migrated from the test environment onto the live shard does not bode well with regard to them being fixed anytime soon.