Intel Centrino N2230 lose Wifi connection since Windows 8 upgrade

Good evening,

I upgraded my Asus N76VZ, equipped with an Intel Centrino N 2230 WiFi board, to Windows 8 at the end of last month. Before this upgrade I din't notice any problem with Wifi connexion (I own it since October 8th).

But since Windows 8 is on my PC, I'm losing WiFi connexion 1 to 3 times per day. When the connexion is lost, it is impossible to reestablish it as I have the message "No connection available". If I launch a diagnostic of the board in the Configuration Panel, the connection becomes sometimes available but is lost again a few minutes later. The only way I have is to restart the PC. Then the connection remains stable for a few hours (variable duration).

I searched on Intel site and I found exactly the same symptom here: http://www.intel.com/support/wireless/wlan/pro3945abg/sb/CS-031631.htm

But as you will see, the problem seems to be corrected with driver 13.2.1.0 and mine is 15.5.6.48. I tried the configuration change described in this page as a workaround, but without effect.

Today, I had the idea to launch the Intel Event Observer utility to capture information. I noticed the connection lost around 16:41. It realy hapened a few minutes before, but not a long time as I was sorting my bookmarks, so I was accessing to internet frequently. The capture's result are at the end of this message.

As you will see there is almost nothing all day long (I started the utility around 10:00 AM). Fire starts at 16:02. There is a first connexion lost at 16:04 but I didn't noticed it, connexion as been re-established without my intervention. The described problem appears at 16:38, but you can see the many messages of authentication between the first (non-noticed disconnection and the noticed one). After this, multiple connections and disconnections are attempts to restart the board using the Windows Control Panel. I finally had to restart the PC.

I hope someone could understand what happens to my system and help me to solve this issue.

Many thanks for your help and time,

Laurent