Hmm, that's very interesting... I am honestly not too sure. As you said, when the adapter is enabled, it's likely some sort of latency or interference. I can imagine the only workaround is a different adapter.
Forgive my ignorance....Is it possible that I just download a different driver or should I change the hardware related to it ? And being a laptop, is it worth all the effort ?
It's likely a hardware specific issue causing the interference, and likely with the adapter itself. If you've reinstalled the latest version of your Atheros wireless adapter, then you've done all you can.
Regards,
Patrick
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