Plex Media Server uses 100% CPU when Generating Index Files

I am running PMS v 09.11.7  I recently added alot of content.  PMS will start fine and will host connections and work correctly.  In 10-20min, sometimes less, the CPU usage will spike to 100% and stay there.  Eventually, the PMS will stop responding, while there is not an error on the desktop and PMS still shows running.  No connections are available and local discovery is also down.  I have logged out and only tried as local PMS, same result.  

Now, if I disable Generate Index Files in Library and Scheduled tacks and restart PMS, it seems to work with out issue.

How do I resolve Generating Index files to have a health DB and backup?

Thanks

2011 Mac Mini, i5, 8GB.   Dedicated box for PMS, not other services.