Intel Centrino, signal goes away

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I've heard that , if u have a laptop with Intel Centrino ( wireless internet)
the signal goes away sometimes , just for 2 seconds , my friend bought a laptop (acer aspire) and the signal goes away every 10 minutes '( just for 5 seconds) , and he went to the shop were he got it from , and they said , it's normal in the beginning , Is this true? is it normal !?

Karoma

Set the wireless setting to CAM (i.e. NOT PSP) / Turn power saving off on the wireless card.
(Shortcut: Start -> Run -> devmgmt.msc -> Network Adapters -> Right-click on the wireless card -> Properties -> Advances tab...)

Robbe...Reference: http://www.upenn.edu/computing/wireless/faq/hardware.html
Constantly Awake Mode provides the best performance by providing a strong connection between your machine's wireless card and the wireless network's Access Point. However, it drains your battery more rapidly than Power Save Polling mode.

Power Save Polling causes your wireless device to "sleep" periodically by temporarily turning its radio signal off. This mode works separately from your laptop's sleep mode and occurs while the card is in use. As a result, it uses less battery power, permitting a longer battery life.

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tnx