I bought a new Samsung phone last week. I turn it off at night. When I turn it on in the morning, it takes about a minute for the lock screen to display. I realized today that only after I enter my PIN to get past this initial lock screen will I receive notifications if text messages are sent to me.
This is a problem because I'll often start working on a project while the phone is turning on and won't enter the lock screen PIN until hours later. During that time, someone could text me and I wouldn't know.
I've had two other Samsung cell phones in the last 5 years and they didn't have this problem. After startup and display of the initial lock screen, they would notify me of incoming texts even if I hadn't entered my PIN for the lock screen.
Why is Samsung now blocking text notifications until after I enter my PIN on the initial lock screen?
Go to settings and search for 'auto restart' then click on auto restart at set times.
On the top there is an on/off option
Set it to off and you should be good