I'm embarrassed to admit I have the same thing going on. It doesn't bother me. I kind of like having "white noise".
If it becomes too random, I deal with it by turning actual music on, and when I turn it off, the endless loop sticks on the music I've been listening to.
I don't think it is psychosis, I'm on a high dose of antipsychotic. I think it is the ultra-sensitive connections in our brains simply recalling info faster than our conscious minds can control it.