Having an issue that started today. I cannot turn my ringer (or other sounds effects or music for that matter) up. When I hit the volume up button, the "Ringer Icon" shows up but refuses to increase. The sound on/off button is switched on (i.e. no orange is showing) and seems to be working (as when I turn it off, the phone vibrates). Music will not sound (it is playing) without the headphones in. Sound effects do not work. If headphones are in, music plays and sounds normal (through the headphones)and I can control the headphone volume as normal. Sound effects also work through the headphones. Also, I should note, when I hold the home button, Siri sounds normal. Also, when I go to General Settings and move the volume slider, the ringtone sounds as normal (and in fact the slider can be controlled via the vol up and down buttons; also when I make a call and use the speaker phone, it works fine, so the external speaker is definitely working. Any ideas? I've already rebooted and already restored settings. I have not done a full factory reinstall and hope to avoid it.