When I open a file in the Dropbox app on my computer, it always shows that it is syncing, but Dropbox can't sync successfully all the time. And also, every time I sync the files, it freezes my computer. I have tried to install Dropbox on drive D of my computer, uninstall the firewall software, etc., and I have failed. And all my files are Word files, which take up very little memory and have no errors in the way they are named. I also have a steable VPN. Could somebody please help me analyze what causes this problem and what solutions should I take? Thank you very much for your help!