I have a Galaxy Note 4 that is rooted on 4.4.4 Recently, something that sounds like the Audio notification from Google Calendar is constantly sounding off at random times thru the day. There is nothing in the pull down Notification panel to tell me what it is for. No apps seem to have alerts on them, Textra does not show anything, I have gone into Settings and turned OFF notifications for every app on the phone, and it still persists in giving out the audible dong dong sounds. It is waking me up and forcing me to turn the phone off when I need to sleep. This phone has been great for years, and now it is becoming a nuisance. I use MacroDroid to turn off both DATA and WiFi, the internet is totally dead in the water. So, the only outside world contact possible is through Verizon's system. Anyone else have this problem, and if so, how did you get rid of it?