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You can make your own card and dual boot your Nook HD+. The information is on xda.com. I have not done it that way. However I did use the n2acards.com service to make a card for my HD. It was $20 but I was not having luck writing my own card, for unknown reasons. Their application worked for me. So my Nook HD is running Kitkat from the SD card.
Anyway, if you can write the image yourself, you can test your device without altering the firmware on the device. That might give you some indication whether it's a hardware problem, if you continue to experience restarts/resets, then it probably is. In which case you should return it.
We do experience random reboots on our HD+, but not like you are experiencing. Ours is rooted just enough to access the Amazon App Store, but otherwise still on factory specs. I may try making a card for it next month.
My daughter's HD is running jellybean which was installed EMMC (directly--its's not a Nook anymore) and hers freezes and resets at random way more than I like. But that could be her usage. She is a heavy gamer and tends to leave the wifi on all the time.
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