if not I will by the new motherboard or perhaps even take even whole pc to service and try to use the warranty for the motherboard (although very unlikely).

I don`t know what happen but yesterday computer was freezing very often and sometimes even

crashing and in the morning was not better, so I replaced CPU and for now ( 1 hour) is okay.

Another weird thing happened today, when I startup computer one of the windows boot maneger disappeared, lucky I had two on that drive so it was a quick fix, but still, it worriesme.

Also, did you send the report about the issue to tech support? 

If I understood them right they didn`t hear of that problem before.

Also now I am in contact with ASRock tech support, who also give me few things to check, 

Now I have to reinstall all AMD chipset although I don't have much hope for this because issue also happens when I am exiting a bios, I will try in an hour or two.

Today when I did fresh start I manage to a restart computer from windows but at second try reboot again stopped working,

I am now suspecting that PC must be thinking that temperature are too high and then it doesn't initiate the reboot.

But the temp are fine unless it wants  CPU to be around 40 C, normally is with the light work 45c and 42c at idle, those temps should be fine?

Is perhaps bios fault? My motherboard still has only first bios for ryzen 2xxx available, I know there is beta but unless I knew it would fix this problem I wouldn`t take a risk with a beta.