For those who are facing the same issue, if you have Shazam app installed, try removing the Shazam button from the notification panel.I noticed that the issue once ended at the moment when I ran Shazam using the menu icon instead of the notification ...

Have you found a solution?I have the same issue, the notification panel became useless. A reboot helps but the effect doesn't last long. Additionally, Always On Display always ceases to work at the same time as the notification panel gets irresponsiv...