IOS 9 - Sound is not working.

I have an app that plays fine in my iphone 4s with IOS 7.1, but when i try to run it on Ipad air 2 with IOS 9 the sounds stop working. I'm using unity 5.2.2 and xcode 7.1.1 Does anyone have the same problem or know a workaround? PS: I'm also using Vuforia for augmented reality and mobile movie texture asset.