If it’s an intermittent problem, it’s probably not an issue with the SSL certificate itself, but rather you may not be connecting to our server consistently every time.
I just checked your account and I see it was created less than 48 hours from this very post, and your original post was only a few hours after creation.
So I think that this is a DNS caching issue, and DNS cache is just making your browser connect to the wrong location. If so, this should automatically resolve itself after a day or two.
For more information and workarounds, please see this topic: