I've searched around but havent had much luck solving this problem: frequently the ringer will just stop working. The phone still vibrates but the ringer doesn't make a sound. If I try to listen to music, the sound won't work unless I turn the volume to max. After that, I can turn the volume to a normal level and the sound and ringer will function normally for a period of time. Before you ask, no, the silent switch is not engaged. Also the phone does not say that there are headphones plugged in either. Anyone else solve this?