Galexy Z flip 4

[sangmooni]

After updating UI system 6.1, the screen is not working properly, and the black screen is for a while often. Also, it looks like power off and on every single thing happen. 

Message showed system not response UI.

What should I do for my phone?

[Dolgogi]

Is this happening when trying to open apps, like the camera app in your screenshot?

If you're familiar with booting into recovery mode, you could try Wiping the Cache Partition and see if that clears the errors.

[sangmooni]

Thanks for your commenting. But there isn't a fix it up then still gets trouble.