F82 M4 CS weird engine noise

[scape1]

I noticed my M4 CS engine making a strange tapping/clicking noise which comes and goes away (seemingly randomly) whilst the engine is on.

I'm a second owner, and the car's mileage is around 12000km, everything is stock.

In the video, the tapping noise persists up until around 10 second mark, and then suddenly disappears. But it would come back before going away again.

I did some googling, asked other owners around, but can't quite put a finger on it.

Any thoughts?

I still have extended warranty so I can take it to the dealer but still I'd really appreciate it if someone could identify what the issue is (or that it isn't an issue) based on the video.

Thanks in advance!

[RugbyBro]

Noisy valve train for a variety of possible reasons. If you’re got warranty, have a dealer check it out. My F82 had a similar but not quite as pronounced sound - got the valve train adjusted and reset by the dealer under warranty