wireless network/cordless phones/intermittent disconnection

I am having intermittent disconnection issues on my laptop, this has become a problem shortly after upgrading my cable modem to a Broadband Phone model and buying 2 new cordless phones. My laptop keeps disconnecting every 30 minutes or so and esp. if I use the phone. I must then hit "repair" and it connects again. I have read up alot on this issue reguarding routers and phones with 2.4 ghz phones and have tried several things. Such as putting space between the router and phone, switching channels on the router from 6 to 11 and also 1. Updating firmware and driver for router and wireless wlan card in laptop. Here is where i'm stumped tho. I have a broadcom 802.11b/g wlan card in my laptop and a belkin wireless g desktop card in my desktop. On the desktop i have not had one disconnection yet but on my laptop i have. I have also never had this problem until i got the broadband phone and cordless phones. I also have no problem when connected with a hardwire. Someone please help. Here is what i have:

Laptop:
Compaq presario m2000
Amd mobile sempron 1.8 ghz
win xp sp3
128mb ram
Broadcom 802.11b/g wlan

Desktop:
Gateway
P3 733 mhz
318mb ram
win xp sp3
Belkin Wireless g Desktop card

Router:
Linksys wrt54gs v3 wireless router
firmware 4.71.1

Cable modem:
Arris TM502g

Cordless Phones:
Panasonic 2.4 ghz

TY

 

hi

do yo have all the adsl filters on your phone cables ,this happen to me, well something similer worth a try