So, I and my friend played Mexican Train. The game client was a bit lagging, but I thought it could happen.
But after we finished, the client didn't announce the winner and everything got stuck. I tried to log in after killing the task, but it kept saying not responding or my information (ID / password) is wrong.
I wonder it's something to do with specific game, because I never experienced such thing before.

Hello,
I just wanted to let you know that this isn't related to any game you were playing. The Playroom server is experiencing a problem at the moment, this was happening since a few days now, so even if the client tells you that your credentials are incorrect, you don't need to reset your password or try creating any new accounts, just ignore that and wait for the issue to be resolved, which can take some time depending on the availability of the developer especially now since at the time I am writing this, it is quite late in Europe. Once it is solved you will be able to login again normally.