Mid-2011 iMac airport issues?

hey all! imac has been having issue off , on past 2-4 months. keeps disconnecting wi-fi no reason what-so-ever. have reset modem multiple times. , keeps happening. not actual connection because xbox , iphone working fine when imac craps out.

tips/ else dealing this?

 

my imac 2011 21,5" same thing. started after 10.7.3 update, , after trying fix problem plugged in ethernet cable because couldn't stand dropping anymore. i'm pretty sure fault lies in osx, because other wifi devices not disconnect , have tried 2 different modems, , problem persists both of them.

 

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