So, the solution has been to reduce the PHP to v5.6
What I still don't understand is why my pstest site works fine with the original PHP v7.0??
I have asked the host of this question and they have not responded regarding that, all they have said is....
If changing the PHP version down to a lower version worked, that is indicative of a plugin conflict or PHP code issue. As you are on a shared server, we would not be able to make changes to the global PHP configuration. This is something that would need to be worked on by your developer to ensure compatibility.
Upon further searching here, there is indication that one of the PHP scripts is crashing, causing issues. The logs do not indicate what is crashing. See the below error message:
20961558 [Warning] Aborted connection 20961558 to db: 'mcdrac6_shopdb' user: 'mcdrac6_shopdb' host: 'localhost' (Got an error reading communication packets)