XPS 15 9550 freezes randomly (on any OS)

Hello, I'd really appreciate any help anyone can give me.

My situation is the following: I got a new Dell XPS 15 9550 two weeks ago. It was running fine until last night when the screen suddenly went black. I was just using Facebook. The computer was still on but not responding. It would not respond to pressing the power button. So i held the power button for 5 secs, restarted it and kept using it and it would happen again. Eventually, after trying different solutions, I went for reinstalling Windows 10.

While Windows 10 was reinstalling it happened again. The screen suddenly went black and stayed like that forever. I had to turn it off again. Now i have no OS and the computer's stuck in a boot loop. Luckily I had a Ubuntu Linux bootable USB laying around. So i plugged it in and tried to install Ubuntu

But the computer also freezes randomly when trying to install Ubuntu. Sometimes it doesn't even last 10 seconds before freezing, sometimes it lasts a minute. The only difference is that with Ubuntu the screen freezes on the last frame, while with Windows the screen freezes black.

So i ran MemTest86, no memory problems. I ran Dell Diagnostics (the extended test) from the Diagnostics partition. Went to sleep. Came back 4 hours later and Diagnostics said all hardware passed, no errors. The weird thing is that after 4 hours it was still responding, just waiting for me to click OK. No freezing. So I restarted the laptop, tried to install Ubuntu, and again, freezes after a few seconds.

So I really don't know what the problem might be. If it freezes under different OSs, it must be a hardware issue? But memtest86 and dell diagnostics both said hardware is OK. Not only that, but while running diagnostics it didn't freeze for hours.

I would REALLY appreciate any help anyone can give me. Thank you very much.

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