Yours is a Mac so would be interesting to see what crash you get - the windows crashes that are yet to be resolved have been stack buffer overruns.
You appear to have disabled debug logging. So first thing to do is enable debug logging in server general settings / advanced
Then restart the server so we have fresh set of logs created
You mentioned you moved scheduled tasks from 1am-5am to 9am-1pm. Did the crashes move to the new period?
With the debug logging enabled and having restarted the server, wait for next crash on 1.15.1.707 and then restart the server and download the logs - see https://support.plex.tv/articles/200250417-plex-media-server-log-files/
Also look within these areas for any crash reports
Use the Finderās Go menu, select Go To Folder⦠then enter the following in the dialog box that pops up:
~/Library/Application Support/Plex Media Server/Crash Reports/1.15.1.707-d893009fb/PLEX MEDIA SERVER
and also look within the MacOS diagnostics areas
~/Library/Logs/CrashReporter/
~/Library/Logs/DiagnosticReports/