Why does wi-fi fluctuate in one router and not in the other?

I am running a home wireless network. Due to the fact that our basement ceiling has a metal mesh, our router’s signal in the basement does not reach the 1st floor. Therefore, we decided to install a second router in the 1st floor and connect both via cable.  This way the 1st floor router broadcasts wi-fi the signal from the basement router.  Both routers are D-Link, DI-624 models. The situation is this:

-     when we connect our laptops via cable (LAN – to  laptop) we get a steady
       speed of 14 mbs
-     when we connect wireless to Router B, we get a strong signal at 14 mbs.
-     when we connect wireless to Router A, we get a strong signal but it fluctuates
       between 2   mps and 14 mps  constantly.

Below is a diagram with the settings.  Is there anything wrong with the settings? If not, what could be the problem?

Diagram.jpg
Erwin KrischAsked:
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aboo_sCommented:
Enable DHCP on both Routers and call them different SSID names ! WEP could be the same but preferred with different.
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Erwin KrischAuthor Commented:
Even if I disconnect Router B from network (pull the plug and cable connection) I get the same behaviour on Router A.
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aboo_sCommented:
Step1:
try switching between two Routers and see if it is adesign or a hardware failure!
Step2:
If it is a hardware prob. try resetting  Router (Reset Button)

Also check if modem has same IP adress like Router (it shouldn't).
Does Router A dial the modem, or is the modem it's self a Router ?
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Erwin KrischAuthor Commented:
I tried everything above suggested. Router does not have same address as ISP. Modem is not a router. Modem is connected to WLAN of Router A. I think the problem is a defect wi-fi circuitry on Router A. I just wanted to make sure that it was not the settings or the layout of the equipment. May question is: are my settings and layout up to what it is supposed to be to work properly?
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aboo_sCommented:
They look like they should work, only it is better to have different SSID for both Routers.

Now when you say modem is connected to wlan of router, which by the way I can see in your diagram, do you mean that the router dials the modem?
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Erwin KrischAuthor Commented:
No, this is a DLS feed. The modem connects to the ISP. If I connect via cable from the modem to my laptop it works with nothing in between.
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Erwin KrischAuthor Commented:
Actually it is a cable connection not a DSL connection. The modem is always on and connected 24/7 to the ISP.
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aboo_sCommented:
Ok, I see,

It's worth checking if one of the Routers is problematic and changing it!

Let me know what happens.
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jasonrthomas3000Commented:
If there are no clients using WiFi in the basement, why are you broadcasting it?
I would be afriad that my clients would bounce back and forth between the two dropping and regaining signal. Even if the pair are broadcasting the same settings, it's not the same broadcast, which could be problematic.

Once you can rule that out, consider you may find that one particular WiFi router performs better than another.  Even if they are the same make/model.  Are they the same firmware version?

Lastly if you find that one of these routers just out performs the other, why not move that router upstairs and configure that for WiFi use?
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Erwin KrischAuthor Commented:
I have with the diagram as a background:
-      switched the upstairs router with the basement router
-      disconnected the upstairs router and used the basement router on its own
-      changed SSIDs with different channels
-      enabled both router’s DHCP and feeding second router’s WLAN with cable coming from LAN of the first  router (each router had its own wireless network SSID with different IPs and different IP scopes to broadcast)

In every scenario the same result: when I connect from LAN to Laptop with cable, no matter which router, the speed is high and constant. When I connect wireless, no matter which router, the signal speed goes very high, but then fluctuates wildly in minutes.

I also bought a new router, but no difference from the above.

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aboo_sCommented:
Ok, let us now eliminate the possibility that the problem comes from the laptop's wireless adapter!
We do that by trying to surf the net with another laptop, or by installing a new USB adapter on the same laptopand surf the net with it!
It's something we should eliminate before moving on!
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Erwin KrischAuthor Commented:
I have three laptops. The same behaviour in all of them.
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jasonrthomas3000Commented:
DI-624 is 2.4GHz, right?  Do you have cordless phones on the same freq?  I have seen cordless phones disrupt or vastly degrade the quality of WiFi service.
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Erwin KrischAuthor Commented:
I boughjt a new router with N technology and that solved the problem. The signal is so strong that I don't need to connect two routers to extend trhe signal.
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aboo_sCommented:
congrads! way to go!
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