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Some Sonys used resistor voltage divider type function switching, where different push switches would make circuit with different value resistors, or direct to ground, and the microprocessor decodes the different voltage levels as stop, play, record etc. Noise and poor contact in the switches can trick it into misbehaving.
Lilewise with the rotary FF-REW search control if yours has that, and the rotary encoder on the bottom of the deck can get noisy and cause problems too.
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