macOS no Alert live video or event

In recent months (or year) the macOS app on Mojave 10.4.6 (MacBook Pro) and current Catalina (MacPro) more often than not will sound the wind-chime alert but when app opens there is no event. This event is viewable on iOS iPhone or iPad when I check. The event eventually appears on macOS.Sometimes the event appears and video window opens just the way it should. I have not figured out why it works sometimes but not most of the time. Doesn't seem to matter if the app is open at the time.Possibly related: When events occur when the Macs are asleep, wind-chime alerts often sound immediately when the Mac awakes. Doesn't bother to open video window but I can check the history to see video.