It’s 1 year old, still has warranty. 800 watt gold+. It had no problems so far. I thought it might be the cause, but SSD seeming disconnected even after restart (not everytime) makes me think it’s either SSD or motherboard. But still not sure of anything.
I unplugged SATA cables last night, booted from Windows USB to install it, SSD disconnected again mid course :) SSD is disconnected somehow and if it happens in OS installed on, it causes crash. On USB, there is no crash. It’s not HDD, not memory or cpu, not SSD (it’s brand new already). I’m down to motherboard at this point.