Bad Gateway mxclientsystem

Mendix app deployed in the cloud randomly got very slow and then I was unable to load a page from the navigation. A progress bar started when I clicked on the page and the app gets stuck there. Client was not responding in any way. I checked the logs and this error was found. No further details available in logs and no other errors.  What could be the reason for this error? Client: Bad Gateway t@  
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