Verizon Developer Edition. Unlocked. Rooted. Kitkat 4.4. I've only had this phone a few days but today I noticed very erratic behavior in receiving calls. Incoming calls don't ring, don't vibrate, don't show up as missed calls. I tried uninstalling Xposed and Gravity. No change. Tried switching ringtones. Tried calling from two different phones.. Tried switching from "Global" to "CDMA/LTE" network. Tried de-activating Sleep Control. Tried turning Airplane Mode on and off. Tried multiple reboots. Tried Bluetooth on and off. I can't figure this out. Maybe 1 call in 5 rings through. The others go to Google Voice mail with no indication that my phone is ringing. I can call out just fine so I don't think its cause I'm in some kind of dead zone. I think this behavior might have started after installing Gravity, but it persists even with Gravity not running and Xposed uninstalled. Any ideas?