Too many re-joins...

My wireless connection lasts only for a couple of hours. Cannot trust it! I have noticed that when the connection is lost, all the lights of the modem are still on and steady, and the Airport Express light is steady green. A manual re-join is in order, and it never fails. Unfortunately, my joy lasts only for a couple of hours until a successive re-join is needed...
1. They have checked, so I was told, that the ADSL line is free of disturbances.
2. Changing the channels does not solve the problem.
3. Putting the iPhone away does not seem to help either.
4. The radio mode in use is 802.11n (b/g compatible).
5. Bypassing the airport by a direct connection between the modem and my iMac keeps the connection fully alive and well, so the problem must be with the Airport Express.
Highly appreciate some help!
Message was edited by: Pink Panther
Message was edited by: Pink Panther

It is very possible that you may have some form of Wi-Fi interference in the immediate area that is preventing your wireless clients from getting a good clean signal from the AX.
I suggest you perform a simple site survey, using utilities like iStumbler, or AirRadar to determine potential areas of interference, and then, try to either eliminate or significantly reduce them where possible.
Look for other Wi-Fi operating nearby, especially those with the strongest signal value ... AND operating on the same radio channel as your AX. Also, if you use a portable phone system or baby monitor that operates in the 2.4 GHz band, these may cause clients to loose their connections.

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