I have been using NowTV via the app on PS5 for the last couple of weeks.
There is definitely a small 'stutter' in the picture every few seconds. Audio is absolutely fine and no lip-sync issues either. Has anyone else noticed this?
I also use the NowTV app on my Sony Android TV and my PS4 - it works perfectly on both these devices with no stutter at all.
The PS5 is very new there is probably just a few minor bugs in it that will get worked out over the next week or so kind of expected I would say with new devices.
If you want you can report the issues to Live Chat