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It is probably re-indexing stuff (or is stuck reindexing a corrupt book). Just search for '.' from Home screen and check search results for 'text in books'. This will show a list of 'items not yet indexed' if it is still indexing. If something in that list persists, you need to delete it and get a fresh copy, or indexing will keep running as a background process and drain the battery faster than normal.
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