As discussed on email, I checked your website.
1. I reviewed the way you have used our plugin and it looks obviously suspicious to Google that rating are not given by direct users. It has more than 60 ratings but how many days it got so many ratings within? Sudden increase in ratings flags things to Google.
2. Use of RDFa & MicroData together. This is not recommended.
3. Your website seems very new and has no mentions over the Internet. Please check this Google search page and you would get what I mean -
Your website has to be trust worthy and authoritative in order for Google to display rich snippets. Try building good quality backlinks to your website.
Also check the results from testing tool - http://goo.gl/FhJ5VQ all things from our plugin are validated.
If you wish your rich snippets to reappear, simply, try building reputation of your website with quality backlinks and do not hurry up with reviews. A website with no quality backlink but with over 60 ratings look suspicious to Google.
Again, there is no issue at all with the plugin as it validates perfectly through rich snippets testing tool. And the plugin does not control display of Rich snippets in SERP. It is totally upto Google.
Best luck with getting back your Rich Snippets John!
I would really appreciate if you would revise your ratings :-)