1. Bring in a separate power line from the battery to your radio. This isolates your radio from electrical interference and guarantees good electrical source.
2. Bring in a good ground source into the car to ground the radio to
3. disconnect any tie-ins the installer did for your radio.

The radio is grounding itself thru the tie-in lines into your instrument panel thus creating all sorts of havoc.

The top center screw in the instrument panel grounds the panel to the car frame. Check to see it is connected properly.