E2500 drops constantly on iMac

I set up my new E2500 last week, and it works fantastic with every device (iPad, 2 iPhones, iMac, DLink usb, ...) EXCEPT my iMac. That connects, but loses the connection very frequently (say at least every half hour) and I need to turn wifi off and on to get it to reconnect.
I've ensured that the iMac has all system updates, and I've checked that the E2500 is the latest firmware.
Please help, I've reverted to my old WRT54G for now, I'll have to return the E2500 if it won't work consistently with the iMac.
Thanks!

So the Router (E2500) that you have is Wireless-N Router...It is Simultaneous dual-band Wireless-N Router... So that it means it has 2.4 GHz and 5 GHz frequencies...
As far as wireless settings is concern do the following settings ----> You can use same wireless network name or even you can use different network name...
For Channel Settings of 2.4 GHz you can make Channel Width to 20 MHz only and Channel to 6, 9, 11..
For Channel Settings of 5 GHz you can make Channel Width to 20 MHz only and Channel to 40 or 161...
If there is any anti-virus or firewall disable them all as well...
Certainly these settings will help you....

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