PS3 killing other wifi connections

Have recently set up a home wifi network using a D-Link DI524UP wifi router which connects to a D-Link DSL-502T for ADSL2 connection.

PCs:
HP Pavillion Desktop (Win XP sp2) connected via ethernet port 2
a Toshiba A200 via wifi (Win XP sp2)
a Compaq notebook via wifi (Vista Small Bis ed)
PS3 via wifi

Problem is as follows:
We can be using the laptops on www (FireFox 2.0) or email (Thunderbird) and we will get a connection failure. Problems only occur on the laptops, and does not affect the desktop using a standard ethernet connection.
Sometimes when this occurs it requires a full reboot of the laptop to get a new connection.

Technical Stuff
Wifi Router:
LAN:
IP : 192.168.0.1
Sub:255.255.255.0
MAC: xxxxxx.xx.xxx.E8

WAN:
IP: 10.1.1.3
Sub:255.0.0.0
Gateway: 10.1.1.1
DNS:10.1.1.1
MAC: xxxxxx.xx.xxx.E9
Dynamic IP Adressing

WiFi
MAC: xxxxxx.xx.xxx.E8
SSID: Vogon (maybe the name is the problem - to much stomping around)
Encryt: WPA-PSK

DHCP Enabled (Dynamic)

ADSL Modem
LAN:
MAC Address xxxx.xxx.xx.d0
IP Address 10.1.1.1
Subnet Mask 255.0.0.0
DHCP Server Enabled
NAT Enabled

WAN:
IP Address 2nnn.vvv.111.172
Subnet Mask 255.255.255.255
Default Gateway 222.222.96.1
DNS Server 202.22.128.40

LAN CLients:
Valid IP Range: 10.1.1.3 - 10.1.1.254
(Should I assign my Laptops / PC / PS3 each one from this range and close the range down, and move away from dynamic IP's)

DoS Protection

State: Enabled
SYN Flooding checking


Port Scan Protection
State: Enabled
FIN/URG/PSH attack
Xmas Tree attack
Null Scan attack
SYN/RST attack
SYN/FIN attack

Service Filtering
State: Enabled
Ping from External Network
Telnet from External Network

I know it's long winded but it's really hacking me off, and have resorted to putting the PS3 on a LAN port to see if this stops the problem.
I suspect that the PS3 is doing a broadcast which is flooding the network.
Also I have not enabled 802.11g only.
Suggestions please.

 

If you assign then addresses from this range then they wouldn't be able to access the wireless router.

Are you sure the problem is the PS3? Does it work fine if the PS3 is off?

If not then you have to look for sources of wireless inference such as microwaves, 2.4ghz and other wireless networks.