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Add me to the list! I have a iMac (Retina 4K, 21.5-inch, Late 2015) and it will freeze after about 10min or less of inactivty. I have turned sleep off and even screensaver and it makes no difference. Just locks up and becomes entirely unresponsive. Only a hard restart fixes it. This has been happing since BETA 4... I would love to figure out the cause!