The issue is the websites stemmed from our WordPress multi-site area going into a reload loop on initial load.
Note,this is not a redirect loop, but the page continually attempts to reload in quick succession and doesn’t load on first go.
If you do a hard refresh or press ctrl + F5 the website loads fine. This only occurs when you are logged in as an admin user of the Multi-site environment.
We have attempted to resolve by disabling plugins 1 by 1 including any cache related plugins.
Which leads me to think the issue is with the .htaccess file settings for the multi-site environment?