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I haven't pinpointed any potential triggers yet, but sometimes when I come out of sleep or from having a locked screen, after typing my password in and re-entering the OS, about 20 or 30 seconds later, the screen just shuts off and goes to sleep.

I almost always use an external monitor, but can't remember if this ever happens w/out it connected.

One thing that does happen every time is that the password box is missing its blue highlight. My keyboard focus is still inside of it though. When I see this, 100% of the time, this re-lock/sleep happens.

I'm running 10.8.2 mountain lion.

Any ideas on what is causing this, or anyone else experience this?

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I have the same issue from time to time. Mine first appeared when i upgraded to an SSD and installed Mountain Lion, but i have never managed to work out which of these are the cause. I suspect it's a power management issue with the 3rd party SSD. –  nthonygreen Mar 14 '13 at 5:06
    
I'm also running a 3rd party SSD (with ML). I have TRIM enabled. You? –  Dolan Antenucci Mar 14 '13 at 17:20
    
Have you tried 10.8.3? It just came out! –  Can Sürmeli Mar 15 '13 at 9:45
    
I don't have TRIM enabled. Just an OCZ Vertex 4 with no special tweaks. –  nthonygreen Mar 15 '13 at 12:33
    
I just updated to 10.8.3. Hopefully they buried a fix for this in there..There was one fix regarding "display issues coming out of sleep" I think.. will follow up on this. –  Dolan Antenucci Mar 15 '13 at 12:46
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I'm also experiencing this. And, I'm running 10.8.3. I just disabled the password lock. Though, I know this is not an option for many people, as you may be in a work environment and might need to leave your desk for a moment.

EDIT: I'm on Mavericks 10.9.3 now and I no longer have the problem.

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