RODI overflow does seem to happen to a lot of people but is totally (well, almost totally) avoidable. Look into getting one of these Kent Float valves for your RODI container. It would have saved your bacon ;-)
http://www.kentmarine.com/products/float-valve-kit.htm
If you get one, keep in mind that you should not use it as a primary shut off. You should still shut off the primary source water goig into your RODI unit when you are done making water. If you souly rely on the float valve you will get frequent on/off cycles from your RODI (from evaporation of your reservoir) which will prematurely exhaust your membrane.