could you post a picture of the ryzen master overview where you have put it under heavy load?
Like a benchmark or something just to see what it does when stressed.
And as a side note, do you have the latest bios installed?
The fact that RM is crashing quite often seems to indicate something not good in the diver stack.
Do the following, check to see if there is a newer BIOS version and if so update it.
Do the bios update from usb stick and start the process from within the bios. (dont like the windows flash things).
After that download the latest chipset drivers from the amd website and install these.
Try again and see if RM is now stable, and probably the whole problem has gone away
Do you think bad thermal paste apply is the cause of all of that ?
I don't think that I messed up that part of the building process but I really don't know what causes these high temps on a 3 fans radiator...
I dont think you would mess it up, unless you have used very very little, but otherwise that should not be the issue.
Is you're memory stable? have you loaded xmp? because those timings really seem very poor.
Ah oke, the good thing is that we have found the problem
now i will tell you how to fix it.
Boot in bios, somewhere there are some memory settings, there you can enable an XMP profile. Just activate that and reboot.
i will check how it looks with ur board
Something like that in bios. You need to select xmp, or d.o.o.c.p or something, been a while since i had asus board.
If you have done it correctly you would see somewhere ddr4 3200mhz 16-18-18-36 1.35V
Don't value to much about all the stuff going on in the picture, its just a quick reference i found online just focus on the memory profile.