Imac;internet connection drops but other devices still work fine

Hey Guys,
I have an Imac 2.5 Ghz running Lion 10.7.5. My internet connection keeps dropping about every 30 minutes or so while my other devices (Mac book and iPhone 5) are working absolutley fine. This is resolved when I turn my wifi off and on, but only for about 30 minutes. Using browsers is fine this way but say online gaming is a disaster. I've tried several approaches, I renewed my DHCP license, which seemed to work for a while but after a few weeks the problem resurfaced and renewing didn't work anymore. I tried different DNS adresses but that does about the same as turning the wifi of and on. I tried rebooting the router too, didn't work and i tried deleting my network and forcing the computer tos tart all over again. I also tried chaning the MTU size, also with no avail.
Any suggestions would be very welcome!
Cheers,

There is a utility called iPhone Configuration Utility that you can download from apple.com - iPhone Configuration Utility 3.5 for Mac OS X (there is a windows version as well).
You can connect the iPhone via USB to a Mac and try to connect to WiFi, the Summary tab produces a console log of the connection messages.
If the unprotected access works, but protected does not, the hardware has very little knowledge of higher level protocols. It is unlikely to be a HW issues.
Can you connect to other protected networks other than your home?
Was an Diagnostics run conducted another of your devices?
If you have more than one Access points, it may be worth looking at your configuration at home.

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