Airport signal cutting out on internet?

HI
Just changed over to a 20" intel imac from a white G5 imac and started getting an annoying little problem with airport signal.
The signal strength bar of the airport card on my mac, randomly will drop to one/two bars (normally i'm full signal) - when surfing on the net. The result of this is that pages will either fail to load or become REALLY slow loading. I can resolve the issue by turning off/on the airport from the menu bar - but this is become a pain and I wondered if anybody else had had this issue?
The mac is in the same position as the older one and this never had this issue - so I was wondering if this an intel Mac thing? I've tried Safari, Firefox and Camino and they all do it - so it's not the browser? Any suggestions.....

Well - I did a factory reset which seemed to work and I also increased "Strength robustness" in airport settings - so at the moment it may have solved that issue.....However now another issue has started - !
Whenever I put the iMac to sleep and wake it up the network is lost? The airport express settings are still all there - because my iphone can still use the airport, however the iMac cannot see it? I did select a closed network - could this be the problem? I allowed the airport to access my keychain - but could this be the issue? I also wondered if the issue is arrising from the fact that the new iMac is 'n' compatiable wireless card - yet the airport express is the older type (a,b & g only)? Anybody else had compatiability issues with this - I don't think you're meant to have issues with 'backwards' compatiability? Any offers..............
Message was edited by: B.Brooks

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