Dear, in the clean installation configure a new empty folder, selecting that only synchronize that folder, try to upload 500 photos (approximate size of 1 megabyte per file), and the same thing happened. After synchronizing some files it got stuck.
The truth is that I gave up and abandoned, and just to finish synchronizing, I close and open the application.
The laptop with which I have been testing and returned, was a friend who asked me to reinstall the system.
On my laptop, after I completely synchronized (after closing and opening the application), so that it would finish synchronizing, if I update one or two files (which is how I normally use it), they synchronize without problems.
I have had no problems. If I start synchronizing folders with many files inside, that’s when the problem occurs.
It’s the only thing I can help them with in my use.
If you need another test, please tell me which ones.