iMac 5K spontaneously restarts after sleep
My iMac 27" Retina 5K (late 2014) (OS 10.10.1) spontaneously restarts after sleep, and displays the error message, "A graphics problem has been detected. Click Report to submit to Apple."
An Apple senior advisor ran it through various tests including OS reinstall and decided to replace the computer. The problem did not occur with the replaced iMac for about 2 weeks, but now it's doing the same problematic behavior. BTW, I haven't downloaded any new software since receiving the replaced iMac.
I see from other threads that others are getting the same "graphics problem" error message, but I haven't seen anyone else mention the concomitant spontaneously restarts after sleep. Does this behavior sound familiar to anyone else?
iMac with Retina 5K display, OS X Yosemite (10.10.1), Time Capsule, iPad2