502 proxy error

I keep getting a (seemingly) random error (Below). I’ve pinged my hosting provider as well to try and get to the bottom of it. When I look at non-wordpress pages, it seems to be working okay. I’ve seen other posts here in the forums but no one seems to have a solution or even a true cause of this type of issue as it relates to wordpress. Any help would be greatly appreciated!

Proxy Error
The proxy server received an invalid response from an upstream server
The proxy could not handle the request …

Reason: Error reading from remote server