I can't change channels by typing in a number or selecting it from the guide

Good morning,
Yesterday we noticed that we are no longer able to change the TV channels by typing in the numbers or selecting a channel from the guide. When we attempt to change a channel one of these ways, it acts like the channel is about to change but then it just stays on the channel we are already on. The only way we can change the channel is by hitting the up or down button. Did we accidentally change a setting or is their something wrong with the box. Help...Please!!!
Thanks,
Steph

Reboot the box.
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