sorry for the issue! It’s because of a planned downtime: Planned downtime Dec 20 2017, 9:30 - 10:00 UTC, which should end in a few minutes.
UPDATE: you won’t lose any of your work, except perhaps the last few couple seconds of typing 
sorry for the issue! It’s because of a planned downtime: Planned downtime Dec 20 2017, 9:30 - 10:00 UTC, which should end in a few minutes.
UPDATE: you won’t lose any of your work, except perhaps the last few couple seconds of typing