Lightroomn freezing when exporting (selecting export location to be exact)

[RichBernier]

I suddenly started having this problem when I try to export photos.  During the export process, as soon as I click the button to select the folder to export to, Lightroom freezes.  It freezes to the point where I have to completly restart my PC to get Lightroon working again.  I am on Windows 10 and am running the latest version of Lightroom.  Any suggestions?  I need to get this fixed ASAP.  Everything else seams to be working fine, develope module, etc.
Thanks,
Rich

[AxelMatt]

In a first step I would try to reset the Lightroom preferences to the default settings

How do I reset Lightroom's Preferences? | The Lightroom Queen

[RichBernier]

Thanks, but that did not work.  I tried it right after resetting and it did the same thing.  I just copied back my original preferences file and it still does not work.  Any other suggestions?

Thanks,
Rich

[RichBernier]

UPDATE - I tried something.  My workflows include starting eveything in Lightroom Mobile so that I have access to them for editing from my iPad or iPhone.  I also do most of my editing from Lightroom Classic which is synched with mobile (specific folders).  Once they are edited, I do two exports; one to a permenant folder for access copies (JPG), and then I export them again to another location as DNG files as my master copies and then I delete the RAW files (something new I am trying).  What I did this time that worked is I moved them to a hard drive location not synched with lightroom mobile before exporting.  That worked.  Could it be that I have too much content on the cloud?  I have a total of 1,529 photos on the could using 13.2 GB of 100 GB.  The synched folder they are coming from has 348 photos.  Does any of this make any sense?

Thanks,
Rich