I believe I have may have isolated the cause. I am not sure why but it appears the plugin Appdata Backup is causeing the server to crash. I have the latest version 2024.03.17 installed and its reporting as being up to date as of this post.
I noticed that the issue is every morning the server is unresponsive so I have to reboot, then its fine until the next morning.
I didnt consider Appdata Backup as an issue until this morning, when I rememberd it is running every night.
I have it set to run at 3 AM daily as I have been working on my plex server daily doing various things such as file cleanup, metadata updates and media art such as backgrounds, banners and posters. Because we spend so much time on it each day I back it up daily.
I rebooted the server as usual and had everything up and running. Afterwhich, I did a manual back up and the server indeed stopped responding. I am going to turn off the back ups for a few days and see what happens, although I am 99% convinced this is the issue now. I will update in a few days.