The IP address your website is on, 185.27.134.33, does appear to have been flaky. I think it’s most likely that this is the same issue as with the other three IPs given that the symptoms are very similar, but that’s just a guess on my part. I’ve asked iFastNet for more info about it.
This is definitely unrelated to your website specifically though.
The “big hits” you’re referring to just seems like a small bump. I don’t see any cause for concern there. There may be some bot traffic coming in to your website, but with proper website security and Cloudflare’s WAF they won’t do any real damage. And the total hits usage is still well below any limits, so that’s all fine.
You can try to block bad IPs through Cloudflare, but know that any dedicated attacker will have access to a large number of IP addresses from different locations and providers, which is virtually impossible to block.