Might be a long shot, but have you synced the unit with Kobo of late? Either via WiFi or Desktop?
I'm curious as to whether it could be delays caused by scanning the database to select what tiles should be displayed on the home page, and some of the tables (especially the events) having grown large?
I might be out in left field on this (and am sure that our resident Kobo Database expert davidfor will chime in with ideas).
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