When typing a search in to the URL bar and pressing enter, I get the same Google message everytime with a reCAPTCHA checkbox:
About this page
Our systems have detected unusual traffic from your computer network. This page checks to see if it’s really you sending the requests, and not a robot.
It happens sporadically but most of the time on this machine running El Capitan. Doesn’t seem to happen on my laptop running Catalina.
Version 1.17.73 Chromium: 87.0.4280.67 (Official Build) (x86_64)
No VPN enabled (I have the Browsec extension, but not turned on, and Tunnelbear, again not turned on).