February 25th, 2015 08:03 PM
Sorry for missing your post RehabMan. Just got a whole bunch of snow, 7 feet, over the past 3+ weeks. Guess where I live.
I've seen this issue come and go on the same OS version. It is now gone.
The changes I made were:
1. reduce the overclocking to zero, i.e. use graded speed.
2. use: pmset -a hibernateFile /dev/null