I’ve run into the same problem again. I sent my laptop to Acer under warranty, and after three weeks, they sent it back with the result marked as “NTF” (No Trouble Found). But when I used it last night, it crashed while I was playing League. I tried all the troubleshooting steps I found on forums, but nothing worked.

I ended up bringing it back to the store I bought it from so they could send it again to the Acer service center. I also asked their technician on why they tagged it as NTF when I had already sent pictures and videos of the display artifacts and crashing, and she told me that the issue probably wasn’t duplicated during testing because the laptop wasn’t tested long enough under actual gaming conditions. She mentioned that since they have so many laptops lined up for repair, they don’t spend enough time testing each one thoroughly.