Unstable speed on WRT54G

Hello!
I've been using my WRT54G v.2 for about 4 years now. I had a problem with it 3 years ago when I could not connect to internet via wireless.
I reset the box, and it was up and running again.
But for the last few weeks I have had the same problem again and it dosen't help to reset the WRT54G.
The speed should be 54Mbs, but a few minutes after I reset it's down to 1Mbs most of the time and I can't connect to internet.
Signal stenght is excellent.
My network: 1 PC connected to the WRT54G w/cable (this PC works ok)
2 laptops connected w/wirless (having problems)
1 PC connected w/wireless (having problem)
I have tried to connect all computers to the WRT54G w/cable and they work ok. Also when I connect directly to the modem (supplier is Bluecom).
Wireless Network Mode : Mixed
Wireless Network Name (SSID) : Hmmmm, it is not linksys ;-)
Wireless Channel : 11
Wireless SSID Broadcast is Enable
Security Mode : WEP
I set this after chating w/linksys a few weeks ago:
Beacon Interval : 50
Fragmentation Threshold : 2306
RTS Threshold : 2306
Mac Address Clone is enable
It did not help!
And Firmware Version is v4.21.1, Nov. 6, 2006
I did the upgrade just after I started having problems.
Anyone that can help me???

After a firmware upgrade, you must reset the router to factory defaults, then setup the router again from scratch.  If you saved a router configuration file, DO NOT use it.
Poor wireless connections are often caused by radio interference from other 2.4 GHz devices. This includes wireless phones, wireless baby monitors, Bluetooth (including Bluetooth game controllers), microwave ovens, wireless mice and keyboards, and your neighbor's wireless network. Even some 5+ GHz phones also use the 2.4 Ghz band. Unplug these devices, and see if that corrects your problem.
In your router, try a different channel. There are 11 channels in the 2.4 GHz band. Usually channel 1, 6, or 11 works best. Check out your neighbors, and see what channel they are using. Because the channels overlap one another, try to stay at least +5 or -5 channels from your strongest neighbors. For example, if you have a strong neighbor on channel 9, try any channel 1 through 4.
Hope this helps.

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    >snip<
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