Energy Saver Preferences resetting themselves
I have an issue with a MacBook Pro Retina 2012 16GB 512GB 10.10.5
I set Energy Preferences to never sleep on Power Adapter, plus disable PowerNap.
Regularly, without me being able to find out the cause, Energy Saver Preferences reset to default settings.
I did SMC and Pram resets several times. Still resetting all by itself.
I did upgrade to Yosemite from 10.9 not so long ago (few months). Surely it didn't do these resets before but I can't say how long after it started.
I am willing to go through troubleshooting to find the culprit but I don't know where to start (what to look for in Console logs etc).
I thought the battery might have an issue. Bit old. But looks ok from Coconut:
Age 1318 days
Loadcyles 345
OS X Battery Status Good
Battery Failure None
Maximum charge 6424 mAh
Design capacity 8460 mAh
MacBook Pro with Retina display, OS X Yosemite (10.10.5), 2.6GHz 16GB 2012