F13 wifi goes a little crazy (Networkmanager)

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I've a strange problem with NetworkManager on my fedora 13.
The system is up-to-date and kernel is 2.6.34.7-56.fc13.i686.PAE.

Basically, every minute I lost the connection on the wireless interface (wlan0),
only for a couple of second, but it's really annoying when I'm using
skype, for example.

The connection is very simple: it's not secured! I don't have a static
ip, so I must use dhcp.
I never had any problem with other versions of fedora on this network.
I have only F13 on this laptop (HP HDX18).

--> lspci <--

02:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN
[Shiloh] Network Connection

--> iwevent <--

16:38:40.512753   wlan0    Scan request completed
16:38:43.015620   wlan0    New Access Point/Cell address:Not-Associated
16:38:45.688226   wlan0    Scan request completed
16:38:45.688541   wlan0    Set Mode:Managed
16:38:45.688551   wlan0    Set Frequency:2.412 GHz (Channel 1)
16:38:45.688566   wlan0    Set ESSID:"wlan-ap"
16:38:45.694417   wlan0    Association Response
IEs:010482848B9632080C1218243048606C
16:38:45.694443   wlan0    New Access Point/Cell address:00:23:69:78:FA:49
16:39:38.881457   wlan0    Scan request completed
16:39:41.383649   wlan0    New Access Point/Cell
address:Not-Associated
16:39:44.056186   wlan0    Scan request completed
16:39:44.056845   wlan0    Set Mode:Managed
16:39:44.056873   wlan0    Set Frequency:2.412 GHz (Channel 1)
16:39:44.056912   wlan0    Set ESSID:"wlan-ap"
16:39:44.063084   wlan0    Association Response
IEs:010482848B9632080C1218243048606C
16:39:44.063132   wlan0    New Access Point/Cell address:00:23:69:78:FA:49
16:40:58.856974   wlan0    Scan request completed
16:41:01.359595   wlan0    New Access Point/Cell address:Not-Associated
16:41:04.055649   wlan0    Scan request completed
16:41:04.056419   wlan0    Set Mode:Managed
16:41:04.056447   wlan0    Set Frequency:2.412 GHz (Channel 1)
16:41:04.056485   wlan0    Set ESSID:"wlan-ap"
16:41:04.062461   wlan0    Association Response
IEs:010482848B9632080C1218243048606C
16:41:04.062510   wlan0    New Access Point/Cell address:00:23:69:78:FA:49
..
..

--> /var/log/messages <--

Sep 28 21:14:13 localhost kernel: cfg80211: Calling CRDA to update
world regulatory domain
Sep 28 21:14:13 localhost NetworkManager[1535]: <info> (wlan0):
supplicant connection state:  completed -> disconnected
Sep 28 21:14:13 localhost kernel: cfg80211: Calling CRDA for country: IT
Sep 28 21:14:13 localhost kernel: cfg80211: Regulatory domain changed
to country: IT
Sep 28 21:14:13 localhost kernel:    (start_freq - end_freq @
bandwidth), (max_antenna_gain, max_eirp)
Sep 28 21:14:13 localhost kernel:    (2402000 KHz - 2482000 KHz @
40000 KHz), (N/A, 2000 mBm)
Sep 28 21:14:13 localhost kernel:    (5170000 KHz - 5250000 KHz @
40000 KHz), (N/A, 2000 mBm)
Sep 28 21:14:13 localhost kernel:    (5250000 KHz - 5330000 KHz @
40000 KHz), (N/A, 2000 mBm)
Sep 28 21:14:13 localhost kernel:    (5490000 KHz - 5710000 KHz @
40000 KHz), (N/A, 2700 mBm)
Sep 28 21:14:13 localhost NetworkManager[1535]: <info> (wlan0):
supplicant connection state:  disconnected -> scanning
Sep 28 21:14:15 localhost NetworkManager[1535]: <info> (wlan0):
supplicant connection state:  scanning -> associating
Sep 28 21:14:15 localhost NetworkManager[1535]: <info> (wlan0):
supplicant connection state:  associating -> associated
Sep 28 21:14:15 localhost NetworkManager[1535]: <info> (wlan0):
supplicant connection state:  associated -> completed

 -->   /etc/modprobe.d/network.conf <--

options cfg80211 ieee80211_regdom=IT
options iwlagn 11n_disable=1 11n_disable50=1 disable_hw_scan=1

I forced this options, doing some researches on the net, but the
problem is still there.

Now I stopped Networkmanager and I'm using system-config-network and I
don't see the messages again (I have to manually insert the network
SSID, of course!), but I'd like to use Networkmanager again.

How can I do ?
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