Had the “502 Bad Gateway” message quite a few times tonight, looks like the servers are stuggling with the European heat 
Here in Holland as well, but only via firefox, not via chrome.
I got the 502 early this morning in the US around 2AM. I’m now getting it again at 10PM.
We are aware of the downtime problems yesterday. Should all be up again now.
Currently working on a way to prevent these.