I have fought this Bong! sound for months now. I uninstalled nearly all of the non-Verizon apps that came with the phone, and that didn't seem to help. So, I did a System Reset which has caused me untold grief!!! almost as bad as a Factory Reset. although, it left the remaining apps in place so my email and weather maps stayed put. it stayed quiet for about 2 weeks and I thought all was good. Then I installed Google Calendar "again" and the very next morning, I get a Bong! at 06:30 I used to have an app on the phone that would clean house of left over debris after uninstalling an app, and I can't remember the name of it. I have all of the apps backed up on the SDcard, and the phone is rooted on 4.4.4 it has a Definitive ROM on it.... I am looking for answers on how to get rid of this demon, i am sure that it is buried in the system files somewhere. No Notifications period, there is no clue as to what is doing this.