I just started playing Arkham Knight on my G3-571 the other day. All was going fine for a while, and then it started randomly freezing up for ~5-10 seconds at a time. When that happens, my xbox one wireless controller starts blinking, like it lost the BT connection. Afterwards, the game will resume like nothing happened (e.g. timers on screen continue counting where they left off, etc.), and the controller will reconnect several seconds after that.
I just updated my bios from 1.01 (yikes!) to 1.13 this morning, after the 4th time it happened, and updated the nvidia drivers via geforce experience to 390.77, just released 2 days ago. Yet it is still happening after all that.
I left predator sense running in the background this last time playing, and it looks like there's a spike in GPU usage around when the freezes happened, not sure if that means anything.