Maybe a system notification?
I just made a new macro for my phone with MacroDroid. I do a lot of Craigslist adverts and idiots just will NOT honor your request to Never Send a Text Message, I only answer Phone Calls..... this is how I screen out Nigerian scammers from True Blue locals who will actually come meet me at the grocery store and talk business. Scammers always want to send you money thru PayPal and you always get ripped. You lose the money and you lose the product you sold.
So, I had MacroDroid turn OFF all notifications at 10 PM every night except for the telephone ringer. Nothing else will ever again wake me up at 2 a.m. and ruin a night's sleep.
So, check to see if system notifications are bugging you?
I note that you want:
Telco Ringer
SMS
Calendar Events
With MacroDroid, you can be darn sure nothing else will ever bother you. It is free for the first 5 macros.
* MacroDroid - Device Automation - Android Apps on Google Play