I had two ROG IIs. The first one had a black screen after a month, it was the 12GB RAM 512GB gloss version. ASUS refused to fix, and I filed a claim to get my money back rather than paying their bullshit charge.
I gave them a second chance and ordered the 12GB RAM 1TB matte black version. The screen went black in less than a week, and I got my refund quickly because it was within 30 days.
My hunch tells me it's an issue with the cooling fan being bent in your pocket. Both times I put my phone in my pocket, and when I pulled it out the screen just went black. I think that if the cooling fan bends just a little bit, it does something to the screen that makes the display nonfunctional.
I loved the look of the phone.... but carrying a cool looking brick doesn't help me, and I can't keep ordering new ROG phones.....
I went with OnePlus because I heard rave reviews about the OnePlus 8 Pro. I love the 8 Pro, it is by far a much better phone than the ROG (bigger screen, better resolution, better OS, better camera, 120hz refresh rate).
Honestly, the only things I miss from the ROG is the RGB lighting and cooling fan. I can always buy an LED case for my 8 Pro... but I can't buy a cooling fan attachment. I also miss the air triggers.
The pros of the 8 Pro outweigh the pros of the ROG II. I don't plan on ever returning to ASUS due to the nightmare that is their customer service.