Why do I have to prove I am a human, every time I refresh a page on this site ?

I'm getting that as well on my phone.  Started a few days ago.  Not getting it on my computer. 

Also seeing a 404 error code.

I don't know how to fix it. 

I've been getting that for over a year

every time I leave the site and return

Lucky you. I get it on every page loaded, but I've only been on the forum for a couple of weeks, so I assumed it was 'normal' (if paranoid). Fortunately the CAPTCHA works without manual intervention ~90% of the time, and the other 10% it's a 'tick here if you are human' box.

Same here. I get it every time I want to do anything on here.

As AI hacking gets better and better, you may soon have to provide a retinal scan.