I have used Alcohol (the rubbing kind not the drinking kind although it helps) on the cordless fone buttons to make them loosen them up and work again...I just pour it on saturating the keypad...work the buttons a bunch of times and let it dry completely and they work great till the next time....dunno if it would work on the MP ...I haven't tried it as my buttons work fine so far.... 73 Mike W2GR