Thanks. OneDrive seems to be the culprit. The workaround is to stop syncing your Desktop folder with OneDrive.
Important: Before proceeding, copy the files in those special folders to another folder or external drive. Please don’t copy them anywhere under Desktop/Documents/Pictures. This is because disabling OneDrive backup for a folder erases the local copies of the files. Copying them to a different location beforehand will ensure that you don’t need to download them again from the OneDrive cloud.
- Right-click the OneDrive icon in the Notification area and click Settings.
- Select the Backup tab, and click Manage Backup
- In the Manage folder backup dialog, click on the Stop backup link for "Desktop"
- Click Stop backup in the confirmation dialog that appears.