Alert:Google has noticed potential problems with this site

I got this alert in Webmaster tools, when I click view I get the message:

*url*:Big traffic change for top URL

When I click this I get:

Search results clicks for http://************** have increased significantly. Yay!

Anyone got this before? Is big G just fucking with me? Slightly sensitive to changes as I just finished two big link pyramids (4 tiers, good diversity) and have seen some good increases in the SERPs with very little dancing thus far. Hoping someone can shed some light on this strange alert. Thank you!

You should have counted your blessings as mine "has decreased significantly!" Nay! That's because my SERP have dropped significantly due to Panda 3.3 and has not recovered since..

I'm sorry to hear that. One of my friends used a service on fiverr which pulled one of his sites out of the clutches of Panda (it was entirely backlinked with BMR). It was something like "70 High PR blog posts", maybe worth a try?

I'm worried because of the "noticed potential problems with this site" line.

I would suggest being very careful because this could be a temporary spike in the traffic and your domain might be heading towards sandbox or being hit with Panda.... i suggest following some white hats link building ( quality links ) for a while..