Two issues, Sound AND Crashing

First up Sound:

When i first get into a titan i lose "most" of the sound. Like its deadened, only get the first snippet of each sound, explosions, shots, voices etc. It never returns after ive been in a titan for the first time.

Second Crashing:

I just get a really simple [HANG] after a round has been played. Essentially, i play one round, it crashes, i have to restart my whole computer. Cant exit to windows etc. Stupid. It crashes when back to the round summary is a guess at what it would be, as it never actually loads. It has a greenish tinge to the screen at that point but its like a fade in from black. No kill count or whatever data actually gets loaded. No error message! Urgh, i have had the game 2 days and might as well stop playing.

Pls help!