If you're on OS X Yosemite, the "sleep wake failure" problem is a well-known issue that is (probably) not hardware-related. I have it, my colleagues (some of wh

If you're on OS X Yosemite, the "sleep wake failure" problem is a well-known issue that is (probably) not hardware-related. I have it, my colleagues (some of whom have brand new machines) have it, and it's probably what you are affected by. The symptom is that the machine will frequently reboot instead of coming out of sleep. From the looks of things, it's related to the 70-minute sleep-to-standby setting (where the machine will turn itself off), which can be changed with "pmset".