Syncing 45,000k Files Indefinitely.

I have a business account, with just over 4TB of data being sync'd.  I have several computers of various ages.  All my computers are downloading the entire data set locally to each computer, since each computer is backing up the data to a local storage in each location.  This workflow works on all my computers, except on one machine about 10 years old.  The majority of the files do sync, but eventually, the sync just stays in some amount of files 15-45k files, and they simply will not sync.

 

I have tried pausing the sync until task manager shows no CPU resources.  When I resume Dropbox, the sync just stays in that high number of files that don't sync.

 

Ironically, some files do sync, but the sync is no longer reliable.  

 

Anyone have any idea how to fix this?  Dropbox's official position is that I have too many files, and that they don't support local storage of too many files.  Not sure what too many is, but I officially have too many per support comments over the past several months.

 

Any help is appreciated.