A couple of questions:
1. Can you try disabling your antivirus? Or more specifically, add an exception in your AV to not scan that appdata folding folders, and also the folding folderrs in Program Files
2. Are you switching users at any point during the folding process? (ie. you fold, log off or change passowrd, someone else logs on, etc)
If the above post does not work, try adding another flag: "-local"
Funny thing is, as I am searching this I am seeing that I have been at some of the threads with this issue before. Looking at my history, I was getting that 7a core status error a few weeks ago, when I changed my user password in the middle of a WU.
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