[T400s] beeping noise when wireless switch is "on"

Whenever I turn on wireless connectivity via the switch on the right side of my Thinkpad T400s 2808-D9G, I hear an extremely annoying, beeping noise. It immediately stops when turning "off" this switch again.
The noise described above is not constant. Sometimes it's accompanying every key stroke. Sometimes on the contrary: It's getting louder when the notebook is idle and stopping when a key is pressed.
It even disappears completely from time to time (for minutes) and then, all of a sudden, it's there again, noisier than ever before!
Does anyone else experience the same problem? Is there a known solution to this? Apart from this, my T400s incl. WLAN, WWAN, Bluetooth etc. is smooth as can be!

Hi tuxor,
is your problem answered here http://thinkpad-forum.de/threads/104224-hochfrequentes-%E2%80%9ESirren%E2%80%9C-der-Funkmodule?p=124...
already?
I think it normal that some sounds are coming out of electronic components, and it not a warranty issue, me thinks.
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Last edited by mgmillani (2014-05-28 11:07:02)

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[T400s] beeping noise when wireless switch is "on"

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