HT4628 My iMac loses its connection with my home wi-fi network when it goes into "idle" mode. That is, if I don't use the Mac for a few minutes, it goes to idle, kind of like sleep. The wi-fi connection disappears and the clock upper right stops working.

I think it's a Lion problem. I had this problem with an old Dell True Mobile wireless router, and hoped it would go away with a new Airport Express router. Same problem. I checked online and saw a lot of message boards featuring questions from people that suffered the interruption of their wi-fi connection, some with Macbooks others with iMacs like me. The problem happens when I don't use the computer for a few minutes. It goes into the Idle mode, kind of like sleep. The connection is severed and the time clock upper right stops. It's weird. There was supposedly an Apple update that addressed this issue, so at the Genius bar two days ago I updated to 10.7.3, downloaded and installed the update. Didn't work. Is it Lion? Is it a wireless card issue? Very frustrating. I subitted a genius bar work authorization with another Apple Genius Bar support tech the next day. He ran some tests. Cryptically said he knew that Apple knew about this and was working on a solution but couldn't tell me what it was. Submitted my info and said I'd be contacted by an Apple tech within 48 hours and provided with a link to another download of another update that should "fix" the problem. I don't know what to do.

I FINALLY SOLVED THIS ISSUE!!!!
New routers have "mixed" modes for your network; this means that it will automatically choose the best option between wireless-B, wireless-G and wireless-N network modes. I used to experience this issue using the 2.4 GHz. mixed mode wireless network.
Thankfully, my router can create 2 networks: a 2.4 GHz. network and a 5 GHz. network.
When I randomly changed this value to "use only wireless-B and wireless-G" trying to fix an issue with a wi-fi expander, the iMac wi-fi issue dissapeared! I tried it with wireless-N only, but it didn't work.
So, finally, I have a 2.4 GHz network with only wireless-B and wireless-G modes which works PERFECT with the iMac, and a 5 GHz. network with a mixed* wireless mode for everything else mode.
*PD: by "mixed" mode it means that the router will automatically choose between B, G and N network modes as it fits better.

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and
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HT4628 My iMac loses its connection with my home wi-fi network when it goes into "idle" mode. That is, if I don't use the Mac for a few minutes, it goes to idle, kind of like sleep. The wi-fi connection disappears and the clock upper right stops working.

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