Wifi detected on my iMac, but internet is off an on

I am having a problem with my IMac wifi: basically, it detects my home network and the internet runs fine -- sometimes.  For no apparent reason (the wireless modem is 5 feet away) the internet cuts out, although the iMac is still recognizing my home network and doesn't indicate any change.  I can fix it my turning my wireless on and off, but it will continue to drop off.  Any ideas?

Hay I just left a post  under wifi after sleep problems. Take a look this has worked for me and I had the vary same issue

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