Try uninstalling the display driver
in Device Manager, then restart to auto-reinstall it.
Also in Device Manager click on Display Driver tab, then Update driver, then Browse, then Let Me Choose, then Display. It should have a list of the previously installed drivers
. Try running with each previous driver for awhile to see if the problem persists. This will tell you if the problem is with driver.
If not you may have video chip problem. Are you still under 1 year Asus parts and support warranty?