Dashboard loads for a moment and disappears, errors in console, both Chrome and Safari

(not sure of correct category)
I have a plotly dashboard (and another new one). A few months ago I began experiencing an issue: when I went to the URL, the dashboard would load for a moment and then disappear. Sometimes it would work. I switched from Chrome to Safari and it was fine, but now issue started there too.

Two dashboards where this is occurring:

I’m getting the attached console errors.

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