NET::ERR_CERT_COMMON_NAME_INVALID

[ShampooSteve]

Site has been working fine for 4 months.  Suddenly, visitors to the site see this warning:  

Your connection is not private.
Attackers might be trying to steal your information
NET::ERR_CERT_COMMON_NAME_INVALID

When I click on the "not secure" in the URL bar, it says "Certificate Invalid" issued to "*.myshopify.com"

What's the way to resolve this?   Like I said, setup was fine it was working for 4 months, then went down sometime over the last weekend.  Nothing I can figure out.  Using Godaddy as domain registrar and the A Record and CNAME were set up 4 months ago, worked fine, and seem correct as per the instructions.