Connectivity and Notifications Problem
My iPhone XS Max suddenly stopped showing notifications from all apps except for the stock apps (messages, facetime, calendars, etc..). Gowing through the problem more deeply, I found out that the apps do not connect to the internet (wifi+cellular) until I open the app itself, then I receive all messages/notifications at once.
Updating to iOS 15.2 didn't help fix the problem. I also tried to reset all settings, it didn't help unfortunately. I checked each app's notifications and connection settings, nothing helped as well. Restarting/Turning off the device was not one of the solutions.
I started missing some of my important intenet calls/messages because of this problem and I need to fix it. Any suggestions? Thanks in advance.
iPhone XS Max, iOS 15