I use the "locked" option, but I don't think it makes a difference whether you lock it or leave it on the last page in terms of power usage.
Rather than remove the battery, if it locks up again, there's a small hole on the back of the device you can stick a small paper clip into to reset the device.
Have a look on the about screen to see which version of the firmware you have installed. It might be worth updating to one of the more recent ones. I remember getting the occasional lock/reboot on one of the older firmware, but the more recent ones have been a lot more stable.
I'm currently testing out the open inkpot firmware, which considering it's a development snapshot and not a real release, has been very stable so far. Installed it on the 29th/30th Jan and so far had no issues.
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