Loving my new iPhone 5 but am noticing some sound problems. 1) Incoming calls has no ringtone. I changed ringtones to test. Do Not Disturb feature is OFF. 2) Dial pad has no tones when entering a phone number. 3) I don't hear a lot of sound effects like lock sounds and keyboard clicks both of which are set to ON. Everything else works fine. I can listen to music both with or without earphones. Anyone else having this problem? Fix?