A couple months ago, I built myself a new PC and decided to go all in. My build: https://pcpartpicker.com/list/Dq2spG (minus the cooler because I couldn't mount it). Ryzen 2700X, 1080 ti, 32gb RAM, the full nine yards. Overall, I was pretty happy with my build, and it ran games beautifully. I only have one incredibly frustrating problem with this build, and it's unfortunately a deal breaker.
At seemingly completely random intervals, for no apparent reason, the computer will shut off. Not a clean shut down, but a hard shut down, like pulling the plug out of the wall. The fans will keep spinning, and it just boots right back up. These power offs are completely random. They can happen 10 minutes after boot. They can happen an hour after boot. They can happen a day after boot. It doesn't matter what's running either. I could be playing games, or just browsing the internet. OS doesn't matter either, I dual boot Ubuntu 16.04 and Windows 10 and these random power offs happen on both. Today I was in Ubuntu's recovery mode trying to fix my btrfs partition (it wouldn't mount because a random shut down messed with the transaction log), and I got a random shut down there too.
My motherboard came with BIOS version 0222, and after talking with ASUS tech support, they recommended I update my BIOS to the most recent version, which is version 4018. Unfortunately, this didn't fix the problem.
I'm definitely going to be following up with ASUS tech support, after I get settled into my dorm this year. If anybody has any ideas to fix this, I'm all ears, but otherwise I'm probably going to have to replace my motherboard.
Edit: I'm going to try to reset my power cables, and a different power supply if possible.