Weird freeze while afk

[Bieliq]

If im afk either in battle or campaign after few minutes game totally freezes but no crashes and system is responsive. Alt+F4 helps. What can be issue? It is not power plan. Weird thing i didnt experience any crash yet while actively playing

Edit: just happened my first crash (to desktop) while playing actively, which is even more weird cuz yesterday i played for few hours and no single crash