Sound stop on iphone5 and iphone5s with ios7

Sound stops when coming back from background.
our game have some audio sources to play the background music and sound effect.They works perfect before.
After IOS7 update.when players press home in the game,the sound stops.And when players come back to game,the sound won’t be played until kill the game and restart again.

It happens only on iphone5 and iphone5s with ios7. Iphone4s is OK.
Is it a known problem of unity?

I have the same problem! Like you suggest it can be easily fix for kill app and restart again, but we can’t except the player to do the same because they will think it is a glitch and give us a one star review.

Does anyone find a solution to fix this issue?