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Dell :: E6400 LAN Disconnect

I'm having an issue with my E6400 running on Vista x86. Whenever I leave the computer for a period of time and the monitor turns off by itself, it seems like my network connection gets disconnected.

This only happens on Ethernet and never on wireless. After I come back to the computer, all my network applications are disconnected and I can see my network icon in the system tray flash from disconnect to connected again.

Is anyone else having the same issue and fixed it? I already checking all the power options in Vista and tried updating drivers from Intel and Dell.

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Here's what I've compiled so far:
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I can't imagine a noticable difference in performance

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I also have an option called "Privacy Flexibility" - I assume it has something to do with

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After typing all this out I just realized that the Dell tech may want me to send back the whole computer because there may be something wrong with the frame that allows the vibration to propagate.

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I've had my E6400 for about a week now, by far best laptop I've ever owned. Specs are P8400, 4GB RAM, WXGA+ led, integrated graphics, 160GB 7200rmp HDD, 9 cell, FP reader. However, there are a few problems that really bother me and I can't figure out.....

As a preface, things I have already done/tried: Updated BIOS to A11; Unistalled IDT audio driver and installed Vista High Definition Audio; Updated touchpad drivers; Installed Intel Matrix Storage Manager;

disabled HDD indexing and Windows Search; installed SP1; uninstalled Dell ControlPoint Connection Manager, updated video drivers .....

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