Hanging sound destruction fur (BattleTech)

Hi all. Like many, I bought Supplement Urban Warfare and after receiving fur Raven started to happen some kind of cruel hell ?:
Destroying enemy mech, listening to the sound of its explosions (but not always), and then in different situations (turn the camera, zoom and move the camera) the sound of repeated explosions (sometimes even from multiple mechs).
Spoilertv a bit strange is the fact that various types of tanks, that can not hear
Is there anyone who could solve this problem? If"Yes", then tell me with a decision and that very problem?