I just got a new Samsung UN46D6300, and Samsung HT-D5300 Blu-Ray surround sound system. My Xbox 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.
Also with my TV, while playing games and watching movies, a lot of times the movements are choppy and not fluid at all. Can this be fixed with proper calibration?