Video player loads inconsistently

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The video player loads sometimes, but not usually. I think it's a caching issue, but can't pinpoint it. I recently started using WT3 Total Cache, however, even when disabled, the issue still occurs. One error came up in the browser inspect console, but doesn't show every time:


The video thumbnails show okay, and when you click on one, the video player appears and will play it.

I couldn’t put this link in the main post, due to one link already being there, but here’s an example page: