Network Manager drops wireless connections

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Hi,

I've been using networkmanager for a while now, and in general have found it 
to work well. However, recently it seems to have developed a problem. When 
running a wireless connection it drops the connection every now and then. I 
can sometimes reconnect by just clicking on the desired network again, but 
sometimes I have to restart NetworkManager itself.

System :-
FC4, fully updated
kernel 2.6.14-1.1656_FC4
wireless is ipw2100

The contents of messages, related to NetworkManager are pasted below.

Does anyone else get this ? Could it be related to the firmware I am using, 
which was updated a short time ago ? - I am using the freshrpms package 
ipw2100-firmware (1.3-2). Could it instead be related to my wireless router ?

As an aside, how can I tell what version of the ipw2100 module comes with my 
kernel ?

thanks in advance

Chris

Jan 16 18:05:13 localhost dhcdbd: Started up.
Jan 16 18:05:14 localhost dhcdbd: message_handler: message handler not found 
under /com/redhat/dhcp/eth1 for sub-path eth1.dbus.get.reason
Jan 16 18:05:18 localhost dhclient: Internet Systems Consortium DHCP Client 
V3.0.2-RedHat
Jan 16 18:05:18 localhost dhclient: Copyright 2004 Internet Systems 
Consortium.
Jan 16 18:05:18 localhost dhclient: All rights reserved.
Jan 16 18:05:18 localhost dhclient: For info, please visit 
http://www.isc.org/products/DHCP
Jan 16 18:05:18 localhost dhclient: 
Jan 16 18:05:18 localhost dhclient: Listening on LPF/eth1/00:04:23:8b:7c:60
Jan 16 18:05:18 localhost dhclient: Sending on   LPF/eth1/00:04:23:8b:7c:60
Jan 16 18:05:18 localhost dhclient: Sending on   Socket/fallback
Jan 16 18:05:18 localhost dhclient: DHCPREQUEST on eth1 to 255.255.255.255 
port 67
Jan 16 18:05:19 localhost dhclient: DHCPNAK from 192.168.1.1
Jan 16 18:05:19 localhost dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 
port 67 interval 8
Jan 16 18:05:20 localhost dhclient: DHCPOFFER from 192.168.1.1
Jan 16 18:05:20 localhost dhclient: DHCPREQUEST on eth1 to 255.255.255.255 
port 67
Jan 16 18:05:20 localhost dhclient: DHCPACK from 192.168.1.1
Jan 16 18:05:20 localhost dhcdbd: message_handler: message handler not found 
under /com/redhat/dhcp/eth1 for sub-path eth1.dbus.get.domain_name
Jan 16 18:05:20 localhost NetworkManager: <WARNING>	  (): get_ip4_string(): 
error calling 'domain_name', DHCP daemon returned error 
'org.freedesktop.DBus.Error.UnknownMethod', message 'Method "domain_name" 
with signature "" on interface "com.redhat.dhcp.dbus.get" doesn't exist '. 
Jan 16 18:05:20 localhost dhclient: bound to 192.168.1.100 -- renewal in 76403 
seconds.
Jan 16 18:05:48 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:05:48 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:06:09 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:06:09 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:08:09 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:08:09 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:12:09 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:12:09 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:14:10 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:14:10 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:18:10 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:18:10 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:20:11 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:20:11 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:24:11 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:24:11 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:26:12 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:26:12 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:28:12 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:28:12 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:30:12 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:30:12 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:32:12 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:32:12 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:34:13 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:34:13 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:36:13 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:36:13 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:38:13 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:38:13 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:40:14 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:40:14 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:44:14 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:44:14 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:46:15 localhost NetworkManager: process_scan_results: assertion 
`res_buf_len > 0' failed
Jan 16 18:46:15 localhost NetworkManager: <WARNING>	  (): 
nm_device_wireless_process_scan_results(eth1): process_scan_results() 
returned an error. 
Jan 16 18:48:45 localhost dhclient: Internet Systems Consortium DHCP Client 
V3.0.2-RedHat
Jan 16 18:48:45 localhost dhclient: Copyright 2004 Internet Systems 
Consortium.
Jan 16 18:48:45 localhost dhclient: All rights reserved.
Jan 16 18:48:45 localhost dhclient: For info, please visit 
http://www.isc.org/products/DHCP
Jan 16 18:48:45 localhost dhclient: 
Jan 16 18:48:45 localhost dhclient: Listening on LPF/eth1/00:04:23:8b:7c:60
Jan 16 18:48:45 localhost dhclient: Sending on   LPF/eth1/00:04:23:8b:7c:60
Jan 16 18:48:45 localhost dhclient: Sending on   Socket/fallback
Jan 16 18:48:45 localhost dhclient: DHCPRELEASE on eth1 to 192.168.1.1 port 67
Jan 16 18:48:46 localhost NetworkManager: compute_nameservers: assertion 
`config != NULL' failed


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