I see there's an Intel Device Manager Diagnostics Utility listed under Network on the Support page for the XPS 8900, so you might want to install/run that, assuming you have the Intel I2xx/825xx Gigabit Ethernet Controller. Shouldn't matter to the ethernet adapter, but you might consider disabling USB Selective Suspend in your active power plan on the advanced screen. Is something running the background that hogs the CPU and affects the NIC? What version of Windows is this? Do you know what updates got installed? Where did you get the updated ethernet driver you said you installed? Any recommendations/suggestions greatly appreciated! I've googled and found saw that updating driver or reinstalling driver might fix it - it did not. This does not happen at all on the other machines so it is not a router or switch issue and I've swapped cables and ports and the problem follows the Dell XPS. I see this in Skype for Business - it disconnects then almost immediately reconnects - as well as RDP remoting in to my AWS production servers - it goes black with a message saying lost internet connection and then reconnects. The Dell, however, disconnects for 1-2 seconds. Only on the Dell, this does not happen on the Lenovo or Mac - they are solid as a rock. All cables are high quality cat 6 and I've swapped cables with the problematic Dell as well as swapped ports. My Mac, this new Dell XPS and a Lenovo all-in-one are connected to the switch with new 6' cables. I used new cabling from my FIOS router to a 6 port gigabit ethernet switch. So, following my " wifi" issues, I've gone with a wired ethernet connection.
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