13" Macbook Pro External Display graphics distorted


i bought 13" 2.4ghz macbook pro 2010 couple of weeks ago. yaay~!
until started playing world of warcraft on lg 21.5" monitor external display connected using dvi on 1600x1200 resolution. after 0.5 hr or so, graphics starts getting distorted. toolbars, npc names, damages, char's cloak started showing cubes. after exiting game, mac os desktop show same graphics problem. happened every night played. last night tried playing on 13" mbp monitor without external display, did not seem have problems entire night. problem , should do?
 

could monitor , not graphics card?
 


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