I wonder if anyone is having this problem again/yet? I just experienced this today.. maybe other times in the past but not anything to take notice. Today about everyother call went to voice. The caller said it rang like normal before going to voice. I got notified of voice message but no missed call notice and no lights or ringing. All systems check. Also, if it matters and can't say its for sure but the several missed calls I had were all from other sprint users, however both these users did make calls that went to the ringer for me too...
Anyway, only change I made was the funnyfont on TF3D to the hand font from xda boards. I had made a backup before making that change so I did a restore, we'll see if I miss calls tomorrow then I think I have a problem.