Sound stops working - though voice memo works
I have an iphone 4s with the latest update.
My sound stops working and then comes back on randomly. When this happens i cant hear anything in spotify, youtube, safari or the iphone player. HOWEVER voice memo works just fine, removing any suggestion that this would be any hardware problem.
So how do I fix this? What is the cause? How is this even possible?
iPhone 4S, iOS 8.2