This works for me, I have rx570 too:
If your crashing randomly to desktop without an error try adding +fps_max 75 to your startup parameters in the game properties. Continue going down from 75 in increments of 5 until the crashes stop.
Verified this fix on my sons machine. Above 70 he crashes but every machine may vary, Find the point at which you can play continually without a crash and leave it there.
Hope this helps someone.
before doing that you need to repair the game first, then lower your setting especially ambiance occlusion.
if fps 75 doesnt work, try 70.
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