Videos intermittently failing to load

Hello again - just one more thing…

The externally linked video files within the Eat page and the Shelf page (via Dropbox > HTML Embed) fail to load around 50% of the time, but will instead appear as an empty frame. There doesn’t seem to be any issue with the link or with the video file itself as when right-clicked to ‘open video in a new tab’, the video will load just fine. I can’t work out what’s happening here, or why.

Any assistance, as ever, massively appreciated.



Here is my site Read-Only: