Hello,
I played some time last days and time to time I got horrible freezes and the only way to get rid of them was to restart the game.
So I started to pay more attention at it and now I'm pretty sure freezes for me happen if I go afk for like 10 min.
I can play like 5 hours and everything will be ok but if I go afk in safe zone (without menus open) after that game is often unplayable.
I presume It started since I got lvl 30.
Just in case: win 7, i7-4790, 16Gb ram, gtx 970, game on ssd