I was recording a video the other day and got a notification at the same time and the screen flickered a bunch of lines/bars of static a few times. It hasn't happened since and it wasn't recorded in the video. I didn't have to reset or anything. Very weird.
I stopped having issues when I disabled my always on display on lockscreen. Back then when it was still enabled the phone will be stuck on black screen and had to restart it always. Just a drawback for now since I've been used to seeing my notifs always.