Howdy. I came across this post while reviewing older unanswered posts. Did you find an answer to this issue? If so, please feel free to share.
I moved the thread to the The specified item was not found. as well where it is more likely to be commented on for topics such as this.
No answers, I'm afraid. We worked on reducing the size of the dataset to avoid the issue - but I have a feeling we'll get back to it again at some point :-)