@Marioneward Welcome to the forum. It is most likely the remote as they frequently cause issues and often fail altogether.
Try pairing the remote again as follows:
- Press 7 and 9 together on your Sky remote for three seconds (This resets/clears the remote)
- Press 1 and 3 together for three seconds (bluetooth mode). A connected message should appear on your screen, press continue and it's all done.
If that doesn't help you have a look at the the following troubleshooting guides:
Troubleshooting guide
Remote help
You could also try holding the remote at both ends and giving it a gentle twist as though you were wringing out a cloth. Even though it sounds an unlikely solution it has got many faulty remotes working again (including my own).
If none of the above help then I would request a replacement at the following link: Streaming TV replacement remote
If you are lucky enough to have one available you can use a Sky Q remote while you wait for a replacement to arrive (I currently use one as a secondary remote)
Good luck
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