Could burn white tile method but now can't. Can image slate though fine?

Hi all, I have an Ortur LM2 15w power supply. About 3 weeks old. It seems one night something changed and I can’t figure out what. I was burning white painted tiles Nicky Norton method perfectly fine at 1,2000 mm/s at 85% perfectly and then all of a sudden the following day Nothing. Can’t burn a layer of paint to save my life. Laser is focused and I even tried switching to a G8 and still nothing. Cleaned the stock lens also and still no go on white painted tile…

What is so strange is I can image black slate perfectly and with ease. Not sure what changed but do know the night this happened my Win 10 laptop received latest updates and to me that’s the only thing that changed? Can’t figure this out. I searched and searched issues and everything. I tried restoring the PC to the day before the updates and still nothing. Scratching my head and going nuts

Any suggestions? Did the recent windows update possibly change something? Is there a fix if so? Anyone else have this issue? The updates took place about a week in a half ago and since I’ve been pulling my hair out figuring out why I can’t remove a layer of white paint but can easily enrgrave a layer of black slate.

Thanks

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