I come from china, I played this game 1 year ago.
I'm level 55 now, and I have bought many many packages
I have a lot of friends play this game.
But I cannot login game sometimes.
My friends and most of chinese players have the same situation.
I tried to research it and found the problem .
When I login, the game have 4 http request from "https://storage.googleapis.com/shopheroes-data"
Well, for many reasons, players in china cannot connect storage.googleapis.com, we have to wait a long time, only got a 502 response.
If we want to play game, we have to use proxy or other way.
I advice you to change another way or another website which chinese players can connect.