Nope still happening. But it looks like it has to do something with my power button, after 11 years of usage, something has gone wrong with it, it starts the computer just by gently pressing it instead of full press on.
It is causing the power cycle issue. Once I hard press it, power cycling stops, and the computer boots normally.
I have stress tested the PSU and GPU with benchmarks, they’re working all right and do not restart during the tests.
I will try changing the power button or getting a new one, not sure I will get 11 years old cabinet power button though. Hopefully, this fixes it and I can go back to the windows edition.