Hi @DGL2 and welcome to the forum. The issue you are having is not that uncommon. A restart of the puck will probably resolve the issue for you as it tends to clear software glitches. I works for me when I get the technical fault error message.
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 couple of minutes before the Sky logo appears.
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