“We suspect automated behaviour on your account”

Whenever I visit Facebook now, I get the following message or suspension warning (note the link is from someone else's instagram account posted on reddit and I only link to it because it's the complete warning at a glance)

https://www.reddit.com/r/Instagram/comments/18bsjib/we_suspect_automated_behaviour_on_your_account/

I have no idea what they're talking about or why I'm suddenly getting the message. I originally assumed it was related to my VPN but apparently not.

Anybody else suddenly getting this warning or know what might be going on?