hacking the app


Check your losses instead. It is very possible that you were actually disconnected instead and your last move was never received by the server. Which would explain why trying to get back into live failed.
Your opponen's client talks to the server and not to your client, so they have no way to impact your app/client or connection.


The client can relay that message I think. Not 100% sure.
It is really hard to say anything unless you recall details of the game (in case it is there but just not showing for you for example). It is also possible the server had maintenance and the game was completely lost when it went down.