Radio turns on-off, shrill noises, or comes on when key is in off position. Why? on 2003 Honda Accord

This happens most every day. Its a 2003 Accord. Been going on for 2-3 years. Somedays radio doesn't work at all and somedays it goes on and off every few seconds. The most puzzleing is when the radio comes on when I turn off the ignition!

Asked by for the 2003 Honda Accord
seems like stereo is shorting out inside..