so i just jumped into a 360 the other day. arcade jasper with 120bg hdd. i bought a couple used games to play with the guys at work. i installed gta4 and pgr4 last night to the harddrive to cut down on noise. i played pgr4 single player for about an hour and noticed that at the end of a race, the music and sound effects would get really slow. didnt do it after the first few races but started doing it after playing for a bit. is this normal behavior?? ive not played gta4 since the hdd install yet so dont know if that does it too. also, during the actual racing, it seemed fine except a couple times the music sounded like it was getting some feedback, sorta similar to the noise a cell phone generates when next to a regular telephone, but no slowdowns.