I just got a new Samsung UN55D6300, and Samsung HT-D5300 Blu-Ray surround sound system. My 360 is connected to the TV through HDMI, and the surround system is also connected to the TV through HDMI, no other audio cables. Whenever I play MLB 2k11, the sound will cut out somtimes. It only happens when a bat makes contact with a ball, and it does it anywhere from 5 to 10 times in a 9 inning game. To get the sound back I can either cycle through the inputs on the blu ray player until I get back to the right one, I can switch the tv to another input then back to the 360, or I can unplug the HDMI cable from the 360 and back in - all of these things will make the sound come right back on. I haven't noticed it with any other game yet, but I mostly play MLB lately. It never happened on my Vizio with Panasonic home theater system.