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Quick guide not showing correct time?

I have recently changed the guide time to 8 days from 14 days as per instruction because we lost guide info it was blank that worked we now have the quick guide not in sequence with the programme showing seems to be behind showing previous programme not current one.if we turn the tv and dtr off at mains it comes back on ok then after a while the quick guide starts running behind again?
Any ideas
Nb, November 2013