'clix'ing

[chlore]

I've been using my clix2 for about two years now, and I love it to bits (almost literally-I've dropped it a few times :/ )
Everything was working perfectly for a while until about a month ago when I noticed the down button didn't make an audible clicking sound when I used it.(The up and left made perfectly audible sounds.)
It didn't seem to be a problem, but upon closer inspection, I noticed the ridge between the clicking part of the mp4 and the part that 'recieved' the click was larger on the upper side than it was on the lower.
They don't seem to affect my mp4's performance, but I can't help but wonder if any dust won't get in between the upper gap, and if this could be a looming sign of more problems?
Thanks 8D

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