LRC is only exporting some of my photos

We have been trying to export 79 photos from LRC to a folder on my desktop and not all of the photos get exported.  I then tried to export the remaining 26 and only 4 more made it.  We have turned of and restarted our computer.  We are using Version 13.3.  It seems as if the transfer is getting hung up.  What do you suggest we do?