Sorry for hijacking this thread, but I just got my N810 and have some trouble with the SD card as well.
When you're talking about "snapping" in, do you mean, you push in the card, and with a small click it stays in place. And after pushing it again it will flip out? Just like the RS-MMC on the 770?
Mine is often pushing open the door as soon as I flip the kick-stand, and not staying in place at all. Maybe I should send the unit back?!
Thanks!