Viewing Videos in Sharepoint Hangs Browser

We have an issue where we review videos from a third party over their Sharepoint. Recently we've been having an issue in Edge where browsing through video previews makes the browser unresponsive. We installed chrome to see if it was an edge issue and it worked again. Later however, the issue began to present itself again with kill/wait options and the only way to fix it is to switch to Incognito mode.

Both browser installs are completely vanilla with no add ons running but does anyone have any advice? 

Many thanks!