Second time tonight Google asked me to solve a captcha to prove I’m not a robot before being able to search?

I'm using chrome, no browser extensions (just ublock), not using a VPN, I'm in Germany, share a WiFi with other flatmates, don't think I was infected by a virus and it's the first time it happened ever and already two or three times tonight… what's going on? Luckily I just need to tick a box, no need to solve it further…