I have one of these that's now on its' way out but the problem you have is with dust build up on the micro switches on the front. The best way I can describe how I resolved this with mine is try flicking the buttons on the front, or if you're feeling adventurous, you could take it apart and clean the switches with a proprietry switch cleaner or blast a bit of wd40 through them making sure you mop up all the excess. Should give you about another 6 months or so from it.
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I have one of these that's now on its' way out but the problem you have is with dust build up on the micro switches on the front. The best way I can describe how I resolved this with mine is try flicking the buttons on the front, or if you're feeling adventurous, you could take it apart and clean the switches with a proprietry switch cleaner or blast a bit of wd40 through them making sure you mop up all the excess. Should give you about another 6 months or so from it.