Here are a few troubleshooting steps you can try:
1) Run the Verbatim Setup Wizard – this makes several tweaks to your system which can have the side effect of also improving sync issues with OneDrive for Business.
2) Ensure the “WebClient” service is started and set to Automatic Startup by running the “Services” program in Windows.
3) Add sharepoint.com to your Internet Explorer “trusted sites” list, by going to Settings – Internet Options – Security – Trusted Sites.
4) Try logging in to your site in Internet Explorer, and checking the “Keep me logged in” box on the login page.
