On Friday the 8th we will have a roughly 3 hour downtime in the afternoon (can give a more exact time closer to that). The following Monday (11th) we will also have another brief downtime for about an hour or two.
This last one is tentative, but Friday the 15th, next Friday, we will have an aprox. 1 day downtime.
Do not speculate on any of these please... this is all in preparing the server and services for the upgrade to RS5.2, we want to make sure the transition is smooth. Following Monday's update, there may be some interference in some external services.