If you don't have the right sdcard, it will freeze. You need a Sandisk class 2 or class 4 card for best performance. Faster cards will be slower since they're optimized for writing large pictures or video files, not the small files that Android uses.
Have you worn out your power button? How old is this device?
What is your 32 gb card, just a data card for your B&N rom? (or are all 3 bootable roms?)