The Mozcast Features report shows a 14.5% drop in the reviews snippets showing up in Google over the past day compared to the day prior. This is a massive drop compared to the stability is has shown over the past several months.
Here is the 30 day chart of just how often the review snippets show up:
As you can see, it typically shows up around 34% of queries that Mozcast tracks but the other day it dropped to 29% of queries.
Dr. Pete Meyers who tracks this confirmed it on Twitter as not an issue with the tracking tool:
Looks like a drop in SERPs with review snippets sometime in the past 24 hours -- https://t.co/zezk9DUD3r— Dr. Pete Meyers (@dr_pete) February 17, 2016
Just the other day, Google did say they try not to clutter the results with rich snippets but I doubt this is related to that.
Maybe it is just a glitch?
Did you notice less review snippets/stars in the Google search results?
Forum discussion at Twitter.
Update: It dropped yet another 12% the next day, here is the revised chart from Mozcast: