There have been some issues with suspending commands (like the table command) and connections that are in the process of being removed. That error message was added to 10.2.3 to note when that problem was hit (instead of silently failing like before). You should continue your support case to get a resolution for your issue, as it should eventually get to a developer with more information than I have, and it would be great if you could post that here.
That said, I think that your iRule could use some improvement. It uses multiple suspending commands when one would often suffice (which may be contributing to your problem), and it decrements shared counters. See the examples at http://devcentral.f5.com/Default.aspx?tabid=63&articleType=ArticleView&articleId=2381, specifically the ones under "Events that are happening right now".
Nimbostratus