Just purchased a 2000 K1200LT. The radio worked fine for a couple of weeks. Now it only plays & has sound with the key on the R position. I loose sound when I turn the key on. I have read though the numerous radio issues but haven't ran across this on. I'm will to have it rebuilt or find a used unit but not sure of the problem yet. Why does it work with the key in the R position and not when the key is on?