As of a few weeks ago, when I turn on the radio it will switch to tape mode, then back to radio mode. It just keeps switching even though there's no tape in the deck. Once the switching starts, it won't stop. Sometimes it won't start doing it right away, other times it starts as soon as I turn the radio on. I have no idea what could be causing this, and am hoping that someone can shed some light for me. I'm hoping that I don't need a new radio.