If you just can't scroll down the list of recordings and the info button works on the highlighted recording I would try rebooting the box first by turning the power off and on with either the switch on the back of the box or at the plug.
If that doesn't work you could then try a factory reset.
It's only a partial system reset and not a complete factory reset and on the mini box there are no options to keep recordings because they are on the main box.
You might have to sign into your apps such as iPlayer, Prime, Netflix and ITVX again, (I can't remember if the mini box will pick them up from the main box), also Match frame rate and Standby power consumption will go back to their default settings if you have changed them.