after analysing what files the application was requesting, it became evident that my application was hanging on my high FPS videos in my catalogue. However, it would still function in the foreground partially, until it came time to close out.
Windows 10 resource monitor showed that it wasn't requesting new files, but was still reading my PCIe NVME SSD at close to 1Gb/s; but there were no files to show for it. The CPU tab shoed that handels were still present with the initial 6 items (HEIC & MOV) that it was working on, but no additional media was being processed.
Of the initial items, requested, one of them was a video captured using iPhone 12 Pro at 1080p @ 240fps on the stock camera. I moved those videos to a separate, unindexed folder, reopened Organizer, and the application was able to finish analysing faces and generating thumbnails.
hope this helps someone out there. Adobe Devs, please make note of this bug.
Crash or freeze
Problem or error
None that I know of. When I get a chance, I will see what happens with Slo-mo video from my iPhone 11. There is another recent thread where a user is having difficulty with all videos from an iPhone 12. Don't know whether this is related.