Hi. I don't remember seeing this posted anywhere before, but has anyone experienced "crumbling" keys? My "s," "d," k," "l," and"n," keys seem to be falling apart (see photo -- the inside of the "D" key seems to be disintegrating). It's perfectly usable right now, but I suppose I will have to take it in at some point, and I was wondering about experiences any of you might have had with this. Otherwise, I am pretty pleased with the Macbook for my particular case (mainly writing and using apps like DEVONthink, Thunderbird, Scrivener, Word, Excel, and nvALT). There are times when the computer isn't quite as snappy as I would like (Word), but Word strangely seems to tax even my MBPr, so I am guessing this is a failing of Word more than anything else.