Do you know why my cloud-hosted website would display this? 

For any issues with your cloud services, it is best to email in 🙂

I will send this issue in for you now.

Ok thank you Charles. 

This just happened again right now. I'm not sure who I should email. The problem is also that by the time someone looks at it, the problem has disappeared, but this problem shouldn't happen that often, even if short-lived each time it occurs.. 

It looks like another network attack. These are very common and we have a lot of technology to deflect and mitigate it but now and again we need to scale up a bit to meet demand. This can take a minute or two and you may get very short pockets of slow loading or some 504s like you hit this morning.

We are seeing an abnormal amount of blocked requests, so someone is having fun somewhere.