I have a Mac Book Pro Retina display running OS X Yosemite and recently it has started acting up. Occasionally, upon a trackpad click, the machine stops responding, you can move the pointer, but the keyboard does nothing and clicking the trackpad does nothing. Holding down Command-Option-Esc does nothing. I'm only able to hold down the power button until it forces a reboot when this arises. Upon boot, the machine reports a graphics error:
A graphics problem has been detected.
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I reported the issue.
I ran the Apple Hardware Test (not the extended version though), but no errors are reported. Using an external USB mouse has the same issue.
How can I go about resolving this issue?