You lose all the guide data each time you reboot and it takes up to 24 hours for all two weeks to repopulate. (The system works by populating near term stuff immediately and then the rest based on how far out it is.)
You lose your setting for ZIP code in the weather section of the interactive pages.
Beyond that, not much. There is some risk you might not get a successful software load, but just force again and you'll be good.
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