I have the FE as well & am having the problem. I get no notification, then all of a sudden hours later 6 or 8 will come all at once (or until I open the app).....FB, IG, Voicemail, even Domino's to track my dinner order. Never had a problem until I got this phone
Is there any update on this topic this keeps getting worse on my phone. Clearing Cache rebooting works as a temporary fix. @Samsung needs to do something here or give us all refund this is not acceptable performance for a phone that costs north of $500. Starting to make me think my Apple friends made the right choice this feels like trash software.
Same with my Note 20 Ultra. Time to time no push notifications does not matter WiFi or LTE for several hours and then all at once. Happens every second week or so. Is really a pain in the a.s...