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Wait, I thought of something else... If I'm not mistaken, android launches a process to scan your storage for media files. If there is a corrupted media file, the system can get stuck in a loop scanning the bad file. Did you add any music or video files lately?
If you have bejeweled blitz uninstall it. Keeps media server running for some reason. I would be down to 70 after 5 hours off and now I was only down to 93.

Media Server isn't running. I never figured out what it was though.