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I have a very strange problem:
My Windows 7 laptop is set to show the default windows screensaver after 10 minutes. No matter how long the screensaver is active, the network connections are fine. I know that, because I listen to an online radio all day and it keeps playing, even after the screensaver kicked in.
But: When I return to my laptop and move the mouse to disable and return my work, all network connections drop for a short time. They automatically restore themselves within seconds, but all connections are lost (VPN, Online radio, Putty, ...).
I already tried to change power saving settings, so the network connections are not disabled, but that didn't help and honestly, that was already a desperate deed, because it wouldn't make sense to disable the network cards to save power not when the computer is unused, but when the computer is used again...
Any ideas?

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Wow. Weird. Does the laptop have any vendor power management software installed, or is it using vanilla Windows? – Paul Nov 11 '11 at 11:12
As far as I can tell, no such power management software is installed. I installed the laptop (a dell precision M4400) myself with a Windows from MSDN, so no vendor delivered DVD either... Can this be a hardware issue? Maybe a problem with the docking station? – Daniel Hilgarth Nov 11 '11 at 15:39
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