Since update everything sounds very muffled or like through some head-muffs. Most noticable was when ... Jet-packed right onto an Anti-Aircraft Phalanxturret. It shoots, but I hear no sound of it firing. This is a repeat bug from few years ago (to long to actually remember).
If this isn't the standard sound bug that has been in the game since beta, there is a new sound issue that is caused by spawning in the new construction spawns. It makes the game sound like you're playing underwater.