My radio has developed a new intermittent problem. It'll sometimes switch stations automatically. The audio will fade as though I've pressed the preset, then come back again. Sometimes it'll beep as though I've pressed it long enough to change the preset station. Does this sound familiar to anyone?

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95 E320 Cabriolet, 159K

I was able to fix it myself. I took the radio apart and cleaned the tiny switches with alcohol as well as the dust and lint from the circuit board. I've been using the radio for four days with no problem. Before, the problem would show up at least twenty times a day.