My Pro freezes when I connect USB storage

ok so for about a month and a half now, sometimes when I connect a USB storage device, my MBP (13 inch, from the most recent early 2011 line) will freeze. if there's an animation ont he screen, like the time machine symbol, it will keep going, but no response from keyboard or trackpad. at first it happened with a new cheap USB flash stick, so I thought it was that. but since then, once in a while it happens with my time machine USB hard drive, my android phone, and a different USB stick, none of which have had this problem before on anything, including my earlier Macbook from 2008. ideas/causes? this guy seems to have a similar problem: https://discussions.apple.com/message/15088832#15088832

Hi f,
Try an SMC Reset: http://support.apple.com/kb/HT3964         

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    Try an SMC Reset: http://support.apple.com/kb/HT3964         

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