I've had exactly the same experience. Let me addd one more: when OneDrive decides to back up open files, they ate regularly deleted both from local and cloud. Those are the files I tend to use the most, and I grew so frustrated that I ended recreating my Documents folder steucture in my Downloads folder, which doesn't get synced. (IT is useless; when I complained abou that, they told me that One Drive was a third-party application, and they didn't support those. )