It seems we've managed to get another downtime, and it only took about 8-9 day from the last one.
At the moment i don't know the exact reason for this but things seems to be back in order.

The game has been rolled back to the backup from 20:30 GMT. This would be about 15 min after the connection to the server was lost.
This backup was chosen in the hopes of limiting impacts as much as possible as in effect no rollback has really happened.
The game is open and will remain that way, so anyone needing to recall fleets etc can safely do so.
The game will start ticking again on 2nd June at 21:00 GMT.

We apologize for this having happened yet again this round, we can only hope that it's the last time and that we can finish the round without further interruptions.