Thanks for the replies. Turns out I had a leak (rain) above the radio/cd player and things got wet. I pulled the unit out, took it apart and discovered the water and corroded parts, bummer. I recently installed an electric motor (MotorGuide 36 volt) on my E23 and have the shorepower plugged in anytime I’m on the boat at the slip to keep the batteries topped off. I was on the boat for a few hours doing some paperwork for work with the radio on when it started acting up. I quickly shifted into boat tinkering mode (more fun than paperwork) and found one speaker was hot and getting WAY more voltage (or amperage). I know the charger will charge up to 14 + volts at times and I thought that might be the cause. In speaking with a Jensen tech I was informed the radio should handle anything the charger would throw at it.
By the way, the motor is working pretty well, starts with the flick of a switch, pushes the 23 up to 4 knots, is quiet and fume/smoke free. Took it out a week or so ago with ten foot swells braking across half of the harbor entrance (Santa Cruz) and had enough power to plow through.
Thanks again for the replies, Mark