I'm not sure if the Sony does this... so I am grasping at straws here. But, when you put stuff on the kindle it will index them in the background in order for the search to work. That can really drain the battery.
Perhaps the Sony does the same thing? If you put new stuff on it every day, like maybe RSS feeds and stuff...
Don't know... sounds like a bummer. Hope you get it figured out.
BOb
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