exclamation mark and when I want to turn off wifi, click on the wifi switch and Settings not responding. When I click on wifi in the navigation bar, UI not responding. After that, I have to restart the phone. After the restart, wifi is turned off.
I have got stock oreo(ETL). I tried to root it or restore backups from google play and Samsung cloud but nothing work. Maybe the problem is that in the work we have 5Ghz wifi.
When I revert to stock NUGAT, everything works.
Any idea what could be a problem?