Cloudflare had significant issues this evening, see e.g. https://techcrunch.com/2020/07/17/cloudflare-dns-goes-down-taking-a-large-piece-of-the-internet-with-it/ and https://www.engadget.com/cloudflare-dns-problem-214413940.html.
Access to services is being restored. Tranquility itself was and is fine. Please monitor this thread and https://cloudflarestatus.com/.