Browser is Firefox. I am getting warnings that the connection is not secure and I shouldn't be entering my password as it may be stolen.

What's up with that?

One can get a security certificate issued for the domain in question. We don't have one so the certificate issued by the hosting service is "in conflict" with the domain name, meaning that they don't "match up".

I read a bit on the link in the warning. Weird thing is the ;out of the blue' bit...it's never done this before.