Well, after about a week (of light reading) I had not a single lockup with no SD-card installed. Granted - I didn't read as much as before, but at least one lockup should have occurred by now.
So it seems to have something to do with the SD-Card. I checked my card (a Sandisk Extreme III 2GB) and there were no errors, the card is completely empty, not a single book on it.
Strange.
Ah well - at the moment, the internal memory is more than enough for me.
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