I had freezing up issues on my UX581 while in idle doing nothing or when it would go to sleep. I would have to hold the power button to power down the unit then start it back up among other things. It would freeze doing nothing too with a chrome window open on youtube. I sent it out to a service center they replaced the motherboard I just received it back yesterday and it has not frozen up yet. Still monitoring.
Same ASUS laptop... same problem!!! Had I known this, would never have bought it. If there is a solution out there, I would love to hear about it... thx