Hi @Dimplewick and welcome to the forum.
A restart of the Glass TV will probably resolve the issue for you as it tends to clear software glitches. To do this go to Settings > System Management > Resets & Updates > Restart device. It takes a couple of minutes to completely reboot and you will have a blank screen for a while before the Sky logo appears.
If you are unable to get to the settings then simply unplug the Glass TV at the plug socket and plug it in again after a couple of minutes and allow it to reboot.
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