Lack of Change
Ultimately, if your Ceratons have a post-scarcity society, have already altered their environment accordingly, altered themselves via their existing genetic technology so that their environment, their resources and their genetic disposition are all in perfect balance, then there's no need for a society to change.
Evolution, when you get right down to it, is a biological response to the pressure of change. Revolution, in its turn, is a societal response to the pressure of change. If there is no pressure because no-one lives without what they need, the vast majority don't have to live without what they want, and the need to contribute to that society has disappeared along with the scarcity of what is consumed by the populace, then there is no pressure to change. Change after all takes effort and commitment which in your utopian society carries with it no reward. If it ain't broke, don't fix it would have to be the order of the day.
That said; the one risk you carry is the decay of your civilisation and your society. Once you have all you need personally (and everyone does), what need is there to participate in your governmental structures? What need is there of government at all?
Sure; you're going to get the occasional sociopath who thrives on inflicting pain on others and no doubt there will be some thrill seekers who will act in ways that turn out to be dangerous for those around them, so you will need some security, as well as maintenance personnel to keep your post-scarcity machines running, but you may find that you have a large number of volunteers for this if service is still a value that your society holds dear. But ultimately, this will be a caretaker contingent as the stability of your society is based on the fact that there is nothing needed.
Build your society in a way that channels all that spare time into curiosity (continued research and development), service and preservation of the society in general and provide ample leave time (say rostering people into service for a 2 year stint out of adolescence which then serves to whet their appetite for learning and engineering) and you may find that your society can survive most threats from within over an extended period.