WRT54GX(4) - Wireless Internet Connectivity Issues

I am having a problem with two Linksys wireless routers. One is a WRT54GX (SRX100) and the other is a WRT54GX4 (SRX400). the WRT54GX is the primary router for my home network and is connected to my cable modem.
I have a couple of computers on a wired network connected to this router that never have any problem connecting to one another or to the Internet. I also use the WRT54GX for wireless connectivity for the downstairs and west side of my home. The WRT54GX4 is hardwired to the WRT54GX and provides wireless connectivity in the master bedroom upstairs on the west side of my home. The signal from the WRT54GX downstairs router is too weak in the master bedroom due to copper plumbing for two bathrooms (one upstairs and one downstairs) and the kitchen that are between the master bedroom and the WRT54GX on the opposite end of the house.
Sometimes, both wireless routers work fabulously and wireless connectivity is seamless throughout the house for my kids desktop system, which has a Linksys Wireless-G PCI card, and two laptops, all of which have integrated Intel Pro Wireless adapters.
For a third laptop, I have been using a Linksys SRX CardBus wireless adapter to connect at higher speeds. This is due to the volume of data -- financial records, images, etc., that I typically access from this laptop.
Finally, the two routers have different SSIDs and operate on different channels in the 2.4GHz range. All of my wirelessly-connected systems can see both routers and all are configured to connect to either network automatically using WPA2 encryption with a pre-shared key.
On occasion, one or both of the routers will act strangely. There are a couple of different scenarios.
1. Sometimes, I can connect wirelessly to one of the routers, but I can't get an IP address. My DHCP server is on a server that it is on the wired network downstairs. Of course, without an IP address, I can't do anything on the network, never mind accessing the Internet. In some cases, I can switch to the other wireless router and everything functions normally. Other times, neither router will provide an IP address.
2. Other times, I can connect wirelessly to one of the routers, get an IP address and then access resources on the local wired and wireless networks. However, I won't be able to get to anything on the Internet.
These symptoms do not apply to the systems on my wired neetwork and this has never happened using my LinkSys SRX wireless card on the one laptop. However, the Linksys Wireless-G PCI card in my kid's desktop system and the Intel Pro wireless on the other two laptops do fall victim to these problems.
Last week, we had a friend who worked from our house one day. He brought his laptop. He had no problems connecting wirelessly to our home network or accessing the Internet. He worked all day connected to his office network using a VPN connection. That same day, my wife's laptop could wirelessly connect to the home network. but could not access the Internet. Within a day or 2, neither her laptop nor my work laptop could connect to our wirless network and get an IP address through either of our wireless routers.
I upgraded the firmware on my WRT54GX to the latest firmware and rebooted it. We have also rebooted the laptops several times. Finally, last night, I restored connectivity to our home network through the WRT54GX. However, we still did not have access to the Internet and we could not connect to the WRT54GX4. I haven't the slightest clue how I did it.
This morning, on a hunch, I asked her to try the Linksys SRX CardBus adapter in her laptop. She called me just after lunch to tell me that she was now connected to the Internet -- through the WRT54GX!
This whole situation has me frustrated and it's consuming massive amounts of time. I sure would love to understand what I'm doing incorrectly.
And, please, don't tell me to go buy a new Wireless-N Router and Wireless-N cards for the laptops. I don't have $500 to spare at the moment.
Thanks!

jam7ra,
Please let me know how the beta firmware works for you. If it seems to help, send me a private message and we'll connect offlist so you can forward the firmware to me, if you don't mind.
At the moment, my setup is working well enough that I'm not going to mess with it any more -- until I have another problem.
In the big picture, howver, I am seriously considering moving to a new Wireless-N router and notebooke cards and installing third-party firmware. I'm hearing some good things about that combination that interests me.
Deep down, I really wish that Linksys had made the SRX models upgradable to Wireless-N with a firmware update. Of course, then they can't get another $200 for new hardware. Marketing, I guess.
Thanks.
RIckC

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David1854 wrote:
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