Came across lots of different possible causes:
- Software, as in broken/badly configurer - even Windows Defender could cause it.
- Memory: Re-seating memory modules solved it for one guy...
Is this is temporary freeze and next, it continues?
Or does it just get stuck, and stays stuck?
Next to reseating memory, you may want to reseat the video card?
I dunno, it's a difficult one, lots of possible causes ...