We have a scheduled maintenance on 13/07/2015 which will affect cause a service interruption on all servers. Not all servers will be down at the same time, but each server will have a downtime of about 20 minutes in total.
The cause of the maintenance is to apply a few updates which will improve network performance on the servers, which in turn will result in all servers being able to handle a higher traffic load than they could previously. The update should also reduce packet loss.