New MBP 15" Retina Crashes Daily, Locks-up and Distorts Text and Images.

Why is my new (2 weeks old) MBP Retina 15" crashing and locking-up about 3 to 6 times a day, even while using native programs like Safari? I have all software updates. Also, today the graphics card completely freaked out resulting in distorted text and images. This occured while in Safari. My hourly reboot did repair display distortions, but it occured again later in the day !