Hi guys. Just today i occured a problem with my iphone 4s.... There is no sound from the speaker When i go in "Settings -> Sounds -> Ringtone" and choose a random ringtone, the speaker works without any problem.. However when i go and listen from youtube or spotify or even music player, the volume bar isn't there. I tried to use a snap-off knife in the dock connector and that seems to fix the problem HOWEVER, whenever i restart the phone the problem occurs again, in other words the sound disappears again until i use the snap-off knife again... What can i do to fix it permanently?