problems with netgear WGR614

Hi,
We recently bought a NetGear router. The problem is that my Mac Mini keeps dropping the connection.

The set-up here is:

1 Windows Vista laptop
1 Mac Mini (10.4.11)
1 iPhone

I thought that it was the router, but both the Vista laptop and the iPhone have no problem getting on to, and staying on, the LAN.

The Mac drops the connection periodically. It's not a case of screen saver or energy saver mode, 'cos it happens even as I'm sitting using it. I'm sitting checking mail or chatting on Adium and bang, the machine's off the network. I go and do something else, and when I come back, sometimes it's back, sometimes not.

The AirPort item on the menu bar goes to zero bars, and sometimes when I click it, the Mac can't even /see/ the network, let alone connect to it. So I click on the desktop, and then again on the AirPort menu, and sometimes it displays the name of the WiFi LAN. Sometimes not.

What''s frustrating is that I don't know /why/ it happens, as all the Mac tells me is that 'there was a problem' connecting to the LAN. I have two options: 'OK', or 'Try Again'. A sample of the logs is below.

For info, the Mac and the router are about 10 ft apart, separated by one wall. The two other machines still manage to find and keep their connections, even when twice as far away, and with two walls between them.

Anyone any ideas as to why this happens?

Thanks.

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Apr 8 20:47:14 sivan configd[40]: Error: Failed to join most recent network "NETGEAR", err=88001006 (will search for any others)
SocketRead: read(5) error 0
SocketRead err = -9802
Apr 8 20:55:18 sivan mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds
Apr 8 20:55:25 sivan mDNSResponder: Repeated transitions for interface en1 (FE80:0000:0000:0000:0217:F2FF:FE52:37B9); delaying packets by 5 seconds
Apr 8 20:55:28 sivan mDNSResponder: Repeated transitions for interface en1 (192.168.1.2); delaying packets by 5 seconds
SocketRead err = -9806
cdsa: SSLHandshake failed with error -9806
SocketRead: read(5) error 0
SocketRead err = -9802
Apr 8 20:59:53 sivan configd[40]: Error: Failed to join most recent network "NETGEAR", err=88001006 (will search for any others)
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... and ...

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Apr 8 22:26:51 sivan configd[40]: posting notification com.apple.system.config.network_change
Apr 8 22:26:51 sivan lookupd[3647]: lookupd (version 369.8) starting - Wed Apr 8 22:26:51 2009
Apr 8 22:26:53 sivan mDNSResponder: Repeated transitions for interface en1 (192.168.1.2); delaying packets by 5 seconds
Apr 8 22:26:55 sivan launchd: Server 618b in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[3647]: exited abnormally: Hangup
Apr 8 22:26:55 sivan lookupd[3650]: lookupd (version 369.8) starting - Wed Apr 8 22:26:55 2009
Apr 8 22:26:55 sivan configd[40]: posting notification com.apple.system.config.network_change
Apr 8 22:26:57 sivan mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds

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