After more unplugging and plugging, I find if I take out the y harness and plug one aileron at a time it will sit there all night quiet. Plug the y harness in (which I really need to fly this plane) and all **** hits the fan. Meaning servos acting with no inputs.
Oh, since learning this I have changed the y harness out three times also, with same results.
I don't think it's ducts or something like that, I've been doing this for many years building and testing in the same room. Never had a problem like this.