I have done a fair bit of research by now, and it seems googles Android is partly to blame for removing a wifi system setting, and also partners, like Samsung, who aren't reimplementing it.
What happens, is that I never get any notifications from anything until I unlock my phone or turn on my screen. I think there's a refresh every 30 minutes or so as I seem to get some notifications on the hour exactly. As you can imagine, this is INFURIATING and completely useless as I can't respond to messages as they come in.
This is considered deep sleep, or what it really is, hibernation. I do not see any settings to disable deep sleep entirely or to have wifi and data on during deep sleep. Power saving and Adaptive battery is off. Put unused apps to sleep is off, no apps in either of the three categories either. Wifi power saving mode is off. Always on Display is always on.
All settings and solutions mentioned elsewhere are either removed from oneUI or requires a rom flash to access which is out of the question.
I already charge my phone every day when I go to sleep anyway, I don't care about battery consumption. My S9 gave me notifications on the fly and the battery lasted just fine, maybe 16 hours, at least a days worth of activity anyway.
My A30s that I just upgraded from had the same issue and I legitimately thought that it was a slow piece of bull, until I got my S21 and it had the same notification issues. This is absolutely terrible! Please issue a patch for this. Please.
Solved! Go to Solution.
I have a scheduled Do not Disturb when I go to bed, but outside of those times it still doesn't work.
I have attached a video to the first post showing my settings on the S21.
VST007 changed the link that helped me solve this issue (for now until further confirmation). Here is the link with the quick solution that isn't mentioned in the link of his.
Interesting, so Android system had all notifications allowed mostly, but digging deeper, the vibration and "show pop-up" was turned off. However, sound was on, and I never heard sound anyway.
But, it seems, sending some emails to myself to test as I know for a fact that didn't work before, it seems to work now! I wonder if those settings got changed when I did my Samsung Smart Change Phone app thingy and it copied system settings like that as well. Makes sense, but that means I must have messed with it a long long LONG time ago.
I feel like these things shouldn't be hidden away like that. Or even have 4 different ways of triggering the same actions (notifications on lock screen). I love Samsung but their user friendliness could be a lot better, not just with phones.
Glad to know that worked!
Initially I also thought that the first link is better but then I found the other one more usefull. In reality they both are.