[SOLVED] Computer randomly starts itself up at night

Apr 22, 2020
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Hello, as the title says the computer starts up for no reason some hours after I shut it down. Another strange thing is that if the pc goes to sleep mode after some minutes it will shut down without any warning and won´t turn on with keyboard, or the power button. It´s like dead, but after some time (that ranges from 1h to 9/10h) it will eventually boot up again like nothing has happened, the problem is that it does this by itself, only the clock will show signs of... whatever is going on by changing it´s time to a random one. I thought at a faulty CMOS battery but even after it was replaced the problem is still there.
But when I manage to boot it up it works flawlessly without any error message showing up or high temperatures even when under heavy usage.
This problem is going on by months now, and I kinda learned to live with it, but I would like to avoid crossing my fingers every time I try to start it hoping it will.

My specs:
OS
Windows 10 Home 64-bit
CPU
Intel Core i7 4790
RAM
16.0GB Dual-Channel DDR3 Crucial
Motherboard
ASUS H81-GAMER (SOCKET 1150)
Graphics
NVIDIA GeForce GTX 970ti PNY