Airport express wi-fi connection signal problem

Dear all,
It's been 3 days that I'm struggling with my airport extreme and I can't really understand where the problem does come from. Actually, I have two computer, one 1,5 years old 17 inch mbp with Leopard on it and a brand new 15 inch mbp unibody from this summer with snow leopard 10.6.2.
Here is the situation, both of them work well when I'm at work connecting to the wifi of my office. Hence I suppose it's not a computer problem but the connection with my airport express.
At home, I'm loosing the signal from time to time. The problem seam to be worst with Snow leopard than with Leopard. Namely, I have to stay very very close to my airport express to keep having my signal and therefore internet working.
When I loose the signal, airport utility can't even detect my airport express.
I did a hard reset already. The problem seamed to have gone for 30 minutes then it start again with the drop of the signal.
The other symptoms are the following:
1- On snow leopard I sometime have an exclamation point instead of the bars of wi-fi signal on the airport menu.
2- When I restart airport and manage to get my signal back I loose it after 30 minutes on SL and maybe 2 hours on L. However I must incline that globally leopard is still ok, but sometimes its drops too.
Does anyone has any idea or pointer on how to solve those issue ?
My aiport express is also 1,5 years old. Is it still covered knowing that I took the applecare ?
Please advise
Ps:
I just want to point out that I never had any issue since those 3 days. I was in vacation and I might have done some updates but I don't remember and I'm not sure. In any case, I'm fully updated for now. Wether it is airport utility, airport express, L or SL. Everything is updated.

I just recently had the same problem with my MacBook Pro (Sept '09). I even used an ethernet cable to connect but to no avail. Then I go to the Apple store and it works just fine...
My wife's iMac (September '09) works just fine too. Go figure.

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