You’ll notice a new announcement in your notifications and if you’re now breaching one of the policies you can find out by going to the Ads tab in your campaign.
Once there, click the Columns option and click to add the Policy Details to your dashboard.
Without enabling or adding the Policy Detail column to your dashboard you may still be in the dark but with that in place, you should now have a steer on what’s wrong. In this example Google is saying that the website has rendering problems on mobile devices and so the “limited” bit means that these Ads are not being shown on mobile devices which is a major drawback given this services is for people out and about!!
So check your Adwords campaigns and make sure they’re still up and running without any issues, there is help available from Google, we found this piece of advice from Google about rendering issues https://support.google.com/adwords/answer/2684542?ctx=tltp