The IP address your website is on, 185.27.134.212, has been going up and down for the last 20 hours or so. This could be due to a DDoS attack on the IP address, but I don’t know for sure.
While Cloudflare can protect a website against DDoS attacks, it doesn’t protect the rest of the server. So even if your website uses Cloudflare, another website may not. And if this other website gets a DDoS attack, this may take down all websites on the IP address, including those who use Cloudflare.
Remember, the fact that the server your website is on gets attacked does not mean that your website is the target of the attack. Your website may just be collateral damage to the attacker.