IMac (Intel) :: 27 Inch - Screen Randomly Goes Off?

Jun 2, 2014

I have a 27" iMac. Just recently, the screen has begun to randomly shut off. I then have to squeeze the power button, followed by a click of the mouse. This will bring me back to my password screen. Sometimes, that would be it, other times, it will do it repeatedly, for no reason, and then settle down. 

Just for those of you who are bound to ask me about my Energy saving settings: Computer to sleep – Never. Display to sleep – 15 min. 

It seems to me that this could be a hardware issue, but just incase any of you have had any experience of something similar, I thought I would ask. 

Info:
iMac, OS X Mavericks (10.9.3), 27: iMac 2.7GHz Core i5

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Info:
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Info:
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I have had this for the last few days, so I don't really know what's going on... 

Anonymous UUID:       D4B5793A-92CF-4E5D-33F8-94D77B084C5C  
Sun Aug 31 00:07:39 2014
panic(cpu 2 caller 0xffffff8002c5220d): "zalloc: zone map exhausted while allocating from zone kalloc.8192, likely due to memory leak in zone kalloc.64 (1440851328 total bytes, 22513266 elements allocated)"@/SourceCache/xnu/xnu-2422.100.13/osfmk/kern/zalloc.c:2494
Backtrace (CPU 2), Frame : Return Address
0xffffff81348c3c70 : 0xffffff8002c22fa9

[Code].....

Info:
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Anonymous UUID:       D5BFA84C-1ECE-3EC9-ED1F-6392EF1A3BB8  

Mon Dec  8 02:13:49 2014  

*** Panic Report ***

panic(cpu 0 caller 0xffffff80040e8887): "complete() while dma active"@/SourceCache/xnu/xnu-2782.1.97/iokit/Kernel/IOMemoryDescriptor.cpp:3307

Backtrace (CPU 0), Frame : Return Address

[code].....

Info:
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