Having downloaded Sky Go app, connected to my Sky Q box, I can see all my recordings. When I select what I want to watch, it loads fine, plays about 10 seconds of the recording, then jumps back to the start and repeats this on a loop. You can scrub forward into the recording, but it plays 10 seconds, then returns to the very start of the recording.
This is on a 2017 iMac, OS Ventura 13.7.8
