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Please Don’t Make Me Download Another App | Our phones are being overrun
(www.theatlantic.com)
This is a most excellent place for technology news and articles.
It usually works well on Android. I use it on a few forums.
That's the same with every Android app, though. When you're not actively using your phone, some apps are put to sleep, which also stops their notifications. Very common on Samsung phones especially. You can usually add an app (or installed PWA) to a list of apps that you don't want to sleep.