I got an iMac about half a year ago (2011 version). It has been fine, until recent weeks. Now the iMac loses its connection to my wireless router frequently. I have to turn off WiFi on the iMac and turn it on again to reconnect.
First I thought it might be the problem of my wireless router. However, in the same room, my Macbook Air and iPad work just fine.
I've done all the software update available. Still doesn't work.
What can I do to fix the problem? Any idea?