Hey,
This can mean there’s game server performance issues on our end (however we have no server issues reported by any of our game servers for the past 4 days at the time of writing.)
If you want to be sure we have a server status page here which will show if our servers are running, degraded or down: Status – Gems of War
If our status page is all green, it means the problem isn’t on the game servers but somewhere else in the connection between your device and the servers.
If your home internet is working fine for everything except Gems of War, then it will be an issue somewhere in the connection between us. These issues are usually fixed quite quickly by whichever party has ownership of the problem.