iPhone 4 sound not working
My sound has gone off from my iPhone 4. The ringer works but no sound from music, app, YouTube or anything like this. When I first unlock my phone the sounds for a few seconds and then the volume bar will disappear again.
I have tried restoring my phone and cleaning it with a tooth brush at the dock connector, and also plugging the headphones in and unplugging them as the phones sound works fine with headphones or in a dock.