I spoke to customer support today. The problem in my case is only happening with chrome browsers (including Brave). Safari and a few others are fine. They ran some tests (I use 7.1) and replied with the following:
"I wanted to give you an update at the present moment. I can confirm this is related to an issue with background videos on our end with the latest version of Chrome (116). Our Engineering team is aware of this issue, and they’re currently working toward a fix.
We’re unable to offer a timeline for resolution, but I can assure you that we’re working to have this resolved as soon as possible. "