Until very recent past, when someone searched for our brand name on Google, our G+ page preview with latest post showed up on the sidebar of SERPs.
However, it has just disappeared and we have checked that rel=publisher tags are implemented in SERPs correctly.
We have had a lot of activity on the Google+ page recently and if anything, Google would have improved our display.
Is it possible that Google is thinking that increased activity on our G+ page is spam??