I would never suggest turning it off. The internet needs more security, not less. But the "Please confirm that you are not a robot" suggests there might be a setting to show a Captcha or something. It would be nice to have that available. 

At home my ip address is dynamically assigned, so restarting my wifi is a workaround. At work the ip address is out of my control.

I haven't seen this warning since. Taking ReneDescartes's advice not to worry about it.

Getting the below a lot today, while composing a post.

Quote:

But there is no opportunity to confirm I am not a robot. Then clicking any chesspub link I get:
Quote:

Killing and restarting the browser fixes it temporarily. I suspect my work has increased their security settings in some way.

Not here, but occasionally on other sites. Depending on your browser and privacy settings, you might raise suspicions inadvertently. For example, if you browse from Tor or use a VPN, or if you have been infected by malware that really does act as a bot (which would not necessarily interfere with your normal activities), a server might think you suspicious.

I wouldn't worry about it, though, unless it happens again.