Same here. I am using Turtle beach PX5s and I noticed the audio was cutting out. Especially when there is alot of gunfire going on, the sound just starts to stutter and cut in and out. I thought it was an issue with my headphones at first so I popped in several different games. Dead Space, MW2, black ops. Spent about 3 hours trying to replicate the issue in those games to no avail. I had also swapped out the batteries for some fresh ones just in case. So I popped brink back in and as soon as I get into a heavy fight again, the sound cuts in and out.
My hardware: Xbox 360 Halo reach console, game is installed to HD, Turlte Beach PX5s, wireless controller.
I'm sure its a software issue but I listed the above just in case.