My newly bought iMac is now running OS X Lion. The problem is every time when the system wakes up from the sleep mode, it automatically get disconnected from my wireless network. It then shows that there are no preferred connections available. Sometimes even if it is connected, internet will not work. I am on airport extreme with 5 GHz N-network and it is almost 10 meters away. My iMac shows the full signal. When I was using the Snow leopard, I didn’t see any problem.
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