WDS Issue - Airport Extreme works great, Airport Express slow

Extreme v 7.5.1
Express v 7.4.2
I have the express set up as extended network in my office. Clients connected to the base station have spectacular connection (ie, 20 Mb/s to internet), clients connected to Airport Express have TERRIBLE connectivity (ie, 300 Kb/s to internet).
Restarting the Airport Express seems to fix it, but this is happening on a regular basis.
All firmware is up to date.
How can I troubleshoot and/or fix this?
Thanks

Hi beaknit
I've encountered such issues as well. The reason was that I misconfigured the whole WDS network because I completely misunderstood the concept of WDS (I had transfer rates from 30 to 100 kbps).
I had several APX's interconnected to each other but that's actually not the way to do it. You have to "guide" or "route" the traffic.
Let's say you have this WDS layout:
MAIN
APX1 APX2
APX3 APX4 CLIENT2
CLIENT1 CLIENT3
You have to make sure that ie APX1 and APX2 ie ONLY connected to MAIN; APX3 to APX1; APX4 to APX1; APX2 to MAIN etc.
You MUST consider topology!! DON'T connect ie APX4 to APX3 or APX2!! DON'T connect APX1 to APX2!!
If you make wrong interconnections you can cause signals transmitted between MAIN and CLIENTS to roam through different paths at the same time causing not only slow speed.
After I have analyzed my network and set up WDS according to my topology I could increase the speed of my network from about 30kbps to 3.5Mbps (>100 times faster; whole network running on 802.11g - if you create a 802.11n network, that would mean even more bandwidth of course).
Hope this helps!!
Michael

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Ok, so here's the situation: my internet service provides me with 10Mbps. My cable modem is hooked up to a 4-month old Airport Extreme in my home office, two walls away from the living room, where I'm typing from now. Internet's wireless speed in this living room has always been about 10Mbps, barely any loss when switching my signal from cable to wireless.
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Message was edited by: rgobrasil

After some more analysis, I discovered that this tends to happen everytime a Time Capsule backup is performed.....

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