There was an issue with the sync servers on our end - it did not respond, for the first time ever. We've added additional diagnostics to the monitoring system to learn about such problems earlier and react in time.
Stable Cloud performance is our top priority. Our statistics show that the latest serious incident was more than a year ago (in April, 2018). We make all efforts to minimize the number of such incidents and their impact.
Once again, we apologize for any inconvenience this may have caused.