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RequireJS components sometimes do not load

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RequireJS components sometimes do not load

We are launching a Magento 2.1.3 site, and finding that the site will sometimes load all of its Javascript components and dependencies properly, but sometimes fails to load, in which case a slider is not displayed and the console log shows error messages such as "Uncaught TypeError: $(...).swMegamenu is not a function".

 

How would we go about troubleshooting and resolving the source of these issues?