Thanks for your reply adder, it's my understanding that your link profile has plenty to do with whether you may incur some kind of automatic penalty. Thats why everyone is rushing to clean up their link profiles and disavow links no?
I have already checked against the timeline and yes, it pretty much aligns with panda updates in late 2012 and 2013. The content is similar across the site so if it were considered thin all sections would go down together rather than some ranking better than before and others being hammered.
I don't have dupe content issues, a least according to WMT, and there have been no technical problems with my site nor any scraped content that I have found.