Where do you upload videos for this forum? I am new here 
I’ve uploaded the screen recording on Youtube as an unlisted video.

From 02:38 you’ll see the bug happening with Community plugins disabled.
Flicker on screen means the app has restarted. And if it goes dark means it has hanged.
Today the bug was not happening consistently. So I started typing the same contents in a new file(Temp1) as seen in the video. After typing bold lines it started happening and I quickly recorded it.