I have the same issue : witcher 3 stop working.
My config :
i7 3770k (3,5 Ghz)
16 Ram
GTX 970 Zotak Extrem Core Edition
Win 10.
I played the game 270hours without that issue, but since 3 or 4 days, I have that crash every 5 minutes !
I do not use mods, I play on GoG. ALl my drivers are ok.
I...