My mid-2012 MacBookPro (Model 9,2) has developed an issue with power in the past few weeks. When it is left awake for several hours, but is idle, it powers off. When I turn it back on and log in, it does not give the typical message about being shut down unexpectedly.
I have noticed this in clamshell mode with lots of USB devices and an external monitor attached as well as when it is left open, but told not to sleep in the Energy Saver Preference Panel.
It always happens when left on over night and today happened after it was left idle for about 2 hours.
The problem has just started happening, but I cannot remember if it started right after I upgraded to 10.10.2 or not.
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