Erros 500 and 504 in The/Brain/Bin, Kbin.Earth apparently too

Since yesterday night, every few hours the instance seems to throw the message "500 Internal Server Error", and today also it started showing "504 Gateway Time-out".

Kbin.Earth had the error 500 once yesterday night too, so maybe an issue with DNS, provider or similar? Don't use it as much so haven't seen any errors since.