Has anyone had any issues buying tickets?

I went in the official website and I got a message that said

Your Browsing Activity Has Been Paused We've detected unusual behavior on either your network or your browser. To resolve this:

Sign in to your Ticketmaster account if you haven't already Change your Wi-Fi or cellular network Switch devices or move to a different location if possible

Has anyone else had this issue? I have no idea why I’m getting this message or is it just me? What exactly is unusual?