New subdomain disappears everytime I install Custom WP

Everytime I create a subdomain - and it says “Fully Hosted” (confirmed this). If I do a one-click custom install of Wordpress… moments later I can no longer access it.

In the first instance, I did an installation, then went to the subdomain and it allowed me to do the install that time. After I did the installation, about 30 minutes or an hour later I tried to look through my themes and suddenly the subdomain was dead.

A second time, I did the installation again - and this time it was DOA. I couldn’t get to the Wordpress install from the moment I completed it through One-Click.

Any thoughts?