Macbook pro retina freeze after put into sleep

kts1mg

macrumors newbie
I just bought my new 2013 late macbook pro 15". But it freeze every time when I want to wake it up from sleep. I hooked it up with a my book 2TB external drive as a TM back up disk. But after I unplug the external hard drive the problem is gone. Is it the problem with my external hard drive or is it the problem with power nap? Or should I just ask apple for a replacement?
 
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