I THINK I GOT IT!
I tried xcom enemy within , got 3 crashes in 40 minutes.
all i did from stock was going into intel 3d settings panel, and disable the following 3 options:
- Application optimal mode under 3d and
- both options under energy.
That was it. Restarted xcom enemy within, now playedf or just over two hours without any crash or issue, perceived framerate is a bit lower but rock-solid stable. Now the battery is almost empty so put it on charger.