Drops for a many main keywords while others are still r

Today a ton of my keywords dropped while others have been completely stable or rising. No manual penalty or anything. One keyword in particular has been ranking position 10-15 for 2-3 weeks is now 41 for example.

Recent changes I've done :
-interlinked 5-10 posts to other pages on my site
-removed Hentry from posts to reduce errors (supposed to have a positive effect)

All links seem to be live as before. No major changes done to the site and no thin content on it.

Any ideas what might…

Drops for a many main keywords while others are still r