My ringer isn't working right. Radomly my ringer doesn't finish its tone when receiving an incoming call. I get the first 1/10 second of sound then silence. It's not going to voicemail but is just silent. I can still answer the phone (assuming I heard the quick ring). This is very sporadic as other times the full ringtone will play. I've tried other ringtones, soft boots, etc., but the problem presists (randomly). Anybody else seeing this?