Further to my above reply, I disabled all CSS and JS optimization within Litespeed and purged all cache. That didn’t seem to make any change to the issue. I then went through the plugins again, disabling and enabling. I got down to disabling the last 3 of all my plugins and the issue resolved itself. I then enabled those last 3 plugins and the page continued to work.
Plugins are a tricky, picky, sometimes changing the enable order fixes things! I think my issue is resolved unless you have anything more to add.