Couldn't resolve proxied A record

Hi guys,

I use CloudFlare for all websites for my company. I have no issues and think the platform is great, but one thing that’s baffled me.

Sometimes, on 4G, I cannot resolve the hostname, it’s as if I am hitting a record that does not exist.

As you can imagine this is hard to reproduce but I have a hosting panel with multiple sites on one IP and I could resolve a different hostname that I created at the same time.

Domain: development.hfdgroup.com

Strange thing: Setting my DNS to 1.1.1.1 allowed me to resolve record…

I know without a proper reproducable way to investigate this will be hard, so does anybody have past experience of this? I tried to search forum couldn;'t find anything specific.

Thanks all.