Not sure what is going on here or if anyone else has the problem but my phone randomly is in vibrate only mode. Yes, push the button to turn the volume up but the whole problem is, I can't. The sliders for system notifications, calls, text, etc. are all maxxed out but the icon to the left is still set to no noise, just vibrate. I have to restart my phone to get it working normal and when it does restart, I hit the volume rockers and then the sound will be activated. Not rooted. Stock S3.