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There is a setting in Sophos Endpoint Security to disable "Web Protection" I believe I've seen this issue in the past where a website is not necessarily blocked but the content being downloaded in the background is. You should be able to add the website as "Authrorized" in the Enterprise Console or, start by just disabling Web Protection on your system to see if that's the actual root cause (Disabling real time protection shuts down all the scanners).
Here's a post on the Sophos forums with similar content: exception to web control ? - SophosTalk community
Well the problem there is I want to avoid setting up a blanket allow for the individual webpage for security reasons. but the link you provided looks like there suggesting I contact Sophos and ask them to setup some kind of testing to get it added to the program, so I will give that a shot. in case they cant does anyone have any ideas besides adding an always on exception?