Random occurences of 502 Bad Gateway using WordPress and Nginx

I am new to using WordPress on Nginx and am seeing funny errors pop up here and there.

For a while when I was searching for a new plugin through /wp-admin/plugin-install.php?tab=search&s=captcha&plugin-search-input=Search+Plugins, I get:
502 Bad Gateway

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After a while, everything just started working again fine.

However, now when I try to access anything inside /wp-admin I am getting a 502 error again. The front end of the site works fine.

What are the steps to get things moving cleanly and to prevent this from constantly happening.

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