I'm running on the original 64MB version and haven't had any lockup problems. The only thing that I can think of is you might want to delete all the fonts and see if that helps. I would contact Bookeen support though.
I haven't had battery problems to your extent either. I charge once a week. With the original firmware it was typically showing 50-60% battery after a week. The first firmware update it was down to 20-30% and after the latest I'm seeing 40-50% battery when I recharge.
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