Since updating to kitkat, 90% or more of my incoming calls do not make my phone ring, vibrate, wake up, or react in any way. I've checked all my settings and have no idea what is causing this (other than the kitkat update, apparently). Occasionally a call gets through, and it's always from a favorite contact, but sometimes even they don't get through. I'm not getting any missed calls notifications, either. The only way I know I've gotten a call is if the caller leaves a voicemail. I've had other minor problems since the update, but this is completely unacceptable. Any suggestions?