Been having this issue for a bit. Basically the sound stops playing in Sonic 1, Sonic 2 and Sonic 4 episode one. The first time it happened I just redownloaded the games and then it was fine but now it has happened again and I don't know why.
I am on a 4s with the most recent version of iOS (version 5.0.1). I was just wondering if anyone else is having this issue and whether they know how to fix it.
I did contact Sega and all they had to say was that there are trying to update for iOS 5 as fast as they can.