I Have a DTR1 Which is setup to recieve updates, there are channels 700 - 725 which, when the update is done, are available. I don't switch the unit off at all ,but the next time you access the channels eg a day later you can only grt to channel 705. Any ideas?
Are you in the UK? Because those channels used to be used by Freeview for Interactive TV and will only be used by other channels for that. However they are now used for Digital Radio and the interactive ones have moved to 30X.
If you are in the UK, do a complete Setup as though the box was new as nearly all of the channles changed number last year.
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Try fixfault.com to fix dtt receivers.