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u may want to check out if your SD card is still mounted after your shutdown or reboot. i suspect that is the culprit.i wouldnt call mine shutdown. instead it rebooted (i saw the android word) or whatever that action was (but i checked the last time it was shutdown did not tally with the "reboot" time). everytime this happened, i noticed SD card it automatically "removed". i have just received in my post an 8gb class 4 san disk card and swapped out the default card. so far no problem. it used to have some error messages relating to sd card every 2-3 hrs.u may want to check out if your SD card is still mounted after your shutdown or reboot. i suspect that is the culprit.

with the default card, reboot is a must to have the card re-detected.