Thanks for the message and to consider my request as weel as to guide me.
Yes, there is a post coming from me on Sep. 9 on this thread. Here it is:
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Re: Wifi Constantly Dropping in Lion
Sep 9, 2011 7:04 AM (in response to lhale)
HI,
I have an end of 2009 iMac 21.5 inch (Intel Core 2 Duo 3.06 GHz) , and I can just confirm that I still have the WiFi dropping issue with the last upgrade of Lion 10.7.1 and this is not only after the sleep, it could be anytime. When I re-boot my Mac it seems to stay stable for a quit long period, but then it bugs again.
I have both a ISP router and Airport Express but there is no difference, the dropping occurs with both.
Before upgrading to Lion, I had never never experimented an issue on Wi-Fi connection. WiFi was perfectly working on Snow Leopard.
In addition, I have an iPad and a MacBook Pro bought 2 weeks ago (so with Lion), they both work perfectly.
After reading this forum, I'm sure Apple got a Wi-Fi issue between some machines, at least with the iMac, and Lion.
As regular customer of Apple, it is the first time I'm disapointed by a quality issue like this one, I'm sure they are doing their best to fix quickly the issue. The first step will be to recognize officialy there is an issue and then commit a date to fix it.
Unquote
I agree that the last paragraph , is not helping but this was my thought at that time.
Coming back to my situation, I recognize that the issue is not an easy one and as I'm not a WiFi network expert I will not try to change my current settings as my other devices (iPad, MBPro, iPhone and PC with Windows 7) are connecting perfectly with the WiFi network.
I hope that the details of my experience will help to understand. (MBP is a 13'', Intel Core i7).
I thank you for your attention and I will try to investigate on other forums.