Just received one of these:
…it was ok again on the “Try again” option.
502 is a bad gateway error, so I guess one of the gateways/proxies from your client to the requesting resource (a json get request) wasn’t forwarding correctly. Mostly something at the near end of the chain.
Nothing to worry about if it is temporary, as this is not the end point (the forum / database) 
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Cheers @GamedevCala, thought maybe I’d caught it in the middle of a little upgrade or some changes being made etc