Hi, I have the new iPhone 3gs and recently I experienced some sound issues while playing games in 3gs. I realized that the sound disappeared itself when playing some games for a longer period of time (e.g. more than 20-30 minutes). And I found this problem in several games that I downloaded (including Toki Tori, Paper Toss, and Bejeweled 2). I am not sure if these games were designed to lose sound after playing for a prolonged period of time to save battery or is it my hardware/software problem. Could anyone who is knowledgeable to this issue please provide some feedbacks? Thanks.