Hey

It seems like you've lost connection with the server.
I would suggest clearing your cookies/cache. If you're still experiencing connection lag, flush your DNS.

I'll copy my previous reply from another thread.

Unfortunately, you may disconnect from the fight itself, however, remain connected to the chat.
It also can happen when your opponent has a faulty connection as well.

I'll advise clearing your cache/cookies and flushing your DNS.
It'll help stabilize your connection.
If you have any additional questions, feel free to PM me.