care matters as well. I usually just blow a little at the rubber and wipe it. My D09 lasts almost forever and does not shrink as much as D05In that case I got 3 bad sheets out of 3 and my friends got 2 bad sheets out of 2...
Anyway, I'm not the only one complaining about D09c durability... switching to D05 made my life a lot easier once I adjusted.