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Question: Reprogramming the microcomputer

I have had my CDP-CX355 for several years without having a problem until about three weeks ago. The unit now only repeats the selected track even when Shuffle is selected. I have unplugged and replugged the unit in order to reset the microcomputer according to the troubleshooting instrucyion - to no avail. Do I need to replace the unit or is there something else I can do?