This requires reboot of your Sky box by following below mentioned steps:-
-You have to either “switch off” or “unplug” your Sky box at the mains.
-Switch any other connected devices such as Tv to standby mode and then turn them “off” or “disconnect” them at the mains.
-Make sure that the “power light” on front of your Sky box is “off” . Also check other connected devices are powered “off”.
-Switch everything back “on” at the mains including your TV. The “red” power light on your Sky box will come back “on”.
-After three minutes, press “sky” button on your remote to switch “on” your Sky box. You’ll see a green light display on the front panel of your Sky box.
This will solve your problem. If still the problem is not okay, you can call Sky Customer Service here
http://www.qwiknumbers.com/sky-customer-services