I have wlan too. It is a difficult subject. But most time it is a problem of driver or hardware incompatibility. E.g. you can try to change the slot of the pci network card. It can have a bad impact on the PCI bus, if e.g. the soundcard and the wlan card share one IRQ!
Or a change of the used channel can help. Many router uses channel 6 as default. You can try 3 or 9. You have to tweak long time, until it works.
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