Inconsistent Admin Issues for Multisite install

I am having an occasional issue with a MultiSite install where the admin pages appear broken then, after a manual page refresh, they work. The errors do appear to affect JavaScript / Ajax functionality for the most part but the fault is intermittent, with errors on some days and not others. For example: Yesterday I created a number of sliders with Revolution slider without a hitch but today there are no images or slides visible from the Admin pages (thankfully the slides are unaffected on the website).

The web hosts are based in Denmark and I am in Australia so there are slightly longer than average load-times when Administering the site. Could this have any bearing on the issue..? Or might the issue have something to do with PHP Memory Allocation or server caching..?

Any advice would be gratefully accepted.