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			I've had it once every two weeks or so. I use the official cover with sleep/wake functionality, and at times the light doesn't turn on, which adjusting light levels fixes, or gets stuck "on" and won't turn off even with the power button. Only a restart fixes that.  
 
It's been pretty consistent since I got mine six weeks ago. I've yet to get past two weeks without a restart as a result.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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