Vincent, I'm not sure if I understand you right. Are you trying to tell that something happened and Outerra won't run now at all? In that case, send me eng.log and crash.log. Or are you really complaining that alpha-level software won't run continuously for several hours, and you have to restart it?
Please also consider that other games do not use the new driver features as Outerra does, and it's also what makes it possible for Outerra to do things it can do. Unfortunately, that also means that we are pioneering the usage of these features, and encounter and report many bugs to AMD and Nvidia.