My tablet does the same thing. Just don't completely power off. Once in a while, after turning my tablet off (sleep mode or whatever you want to call it), it wouldn't turn back on again. I had to hold the power switch and the thing would eventually reboot and start back up in the B&N software. This always happened when I wasn't home near my power cord.
So, I tried just replacing the ROM instead of using it from an SD card. I had the same problem of the tablet not turning back on sometimes, but at least it would reboot to CM7 and I could eventually get back to what I was doing.
I got sick of it not coming back on. It happened often enough to annoy me. So, I went back to the original B&N ROM and am learning to be happy with that.
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