It's not random, it's just very counterintuitive. On the one hand, all objects have a wave-particle duality. And then there's the fact that you can't know precisely the speed and position of a subatomic particle, the photons are too energetic. That's why probability is a must when modeling the subatomic world. Otherwise, quantum mechanics is very deterministic, and one of the best tested theories ever formulated.
But if you really must insist on an ontology, read up on the Copenhagen Interpretation, that might make quantum mechanics make much more sense.