Galaxy book 4 pro 360 flickering

I just bought my Galaxy book 4 pro 360 two days ago, I found out when I adjust the brightness down to 50%, with white background, the flickering will apear very noticeably, especially at when typing.  but when increase the brightness up to 60%, it's ok, no noticeable flickering, but 60% is too bright for me in the room, anyone has this problem? or it's this unit is bad?

I reset my computer, graphic driver is the newest. all software is up to date.