Ever since I’ve had my Moto Z phone (about 2 years now), calendar notifications have worked sporadically, and more often then not, it fails to alert me. At first I figured that it was a bug in the default Google calendar that came with the phone, so I installed the DigiCal calendar app. I like the app, but it has had the same problem. The calendar on my tablet (default app) is synced to the phone calendar, and it successfully alerts me even when the phone doesn’t. I’ve searched for answers in the past, but never found anything; most of what I found applies to devices where the calendar NEVER notifies, which is not the case here. I have no idea why I occasionally DO receive alerts. (Maybe it’s when they coincide with the display active, instead of in sleep mode? That’s the only thing I can guess, but I really don’t know if it’s so.) Notifications are on for the app. Battery saver is turned off. “Show all notification content” is set for the lock screen (but Notification dots is off). I'm using Android 8.0.0. Can anyone suggest where else I can look for the cause of this problem?