White and purple screen

I have bought a new MacBook and sometimes (once a week...) it stops working, the screen is completely purple or white and all I can do is turn it off by long pressing of the button. I have no idea what is this caused by, every time I am doing something different.
How could I recognize what is wrong without reinstall the system? Is there any log of errors that could help me if this is hardware or software problem?

Take it to an Apple store or AASP.

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