Split from this thread.
I have same issue as MT_12345 but when dragging a folder to share point. Folder do not weight too much, only 130MB but containing like 4000 files inside. You can try to sync single 130MB file without issue, always when trying to sync folders with thousand small files, this issue persist. Whats most annoying, this happening mostly during normal (UK) working hours and collaboration is not possible. Pausing and resuming not helping. Uploading same files during night time do not see that issue, hence its trolling on Microsoft site.
Solution described above not helping.