Scratch that, still getting drops. Read this "fix" on another thread and haven't had any disconnects for 4 days:
Go into BIOS>Pre-boot> Disable MAC Address Pass-Through.
Seems to cause a conflict when enabled.
see my original post here https://www.dell.com/community/XPS/XPS-13-9310-2020-drops-ethernet/td-p/7756073/page/2
Guess I have a solution!
I had some long-lasting video conferences today and have some really good news...no disconnect issues anymore! Looks like this driver https://www.realtektreiber.de/en/realtek-usb-fe-gbe-ethernet-controller-driver-download-update/ fixed the problem completely!
To be precise:
Realtek USB GBE Ethernet Controller Driver for Windows, update time 2021/06/25
Furthermore, these are my setting for my Realtek USB GBE Family Ethernet Controller which do not solve the problem itself:
adaptive link speed -> disabled
energy efficient ethernet -. disabled
green ethernet -> disabled
speed & duplex -> auto negotiation
Already informed Dell
I'm having the exact same issue. Changing the adapter settings didn't work for me either.
I now have my network connected over an additional hub and it seems to work fine...
Laptop --> HP USB-C docking --> USB Hub (with 3x USB 3 + ethernet) --> LAN
...disabling the Energy-Efficient Ethernet setting makes a little sense as it could affect power state.
Scratch that. Still getting device drops. Even happens when no Ethernet cable is connected.
When the "you've removed a device" sound is heard, the Realtek USB GbE Family Controller device disappears from Device Manager. It then re-appears after the "you've plugged in a device" sound is heard.
I'm at a loss to explain why any device setting would cause it to disconnect and reconnect. I want to say this is related somehow to Dell software shutting down or restarting the Realtek device. I lean against it being related to Dell hardware as I don't see why the hardware itself would be targeting just one device for disconnects and reconnects.
Similar problem reported at https://www.dell.com/community/XPS/XPS-13-9310-2020-drops-ethernet/m-p/7756073. (That is more relevant to my situation because I have a 9310.)
Right when the network cuts out, I hear the tones that indicate a device was disconnected. Then a few seconds later, I hear the corresponding tone for a device being connected, then shortly after that, I regain an Ethernet connection.
Responding to above messages, disabling the Energy-Efficient Ethernet setting makes a little sense as it could affect power state. However, changing the Speed & Duplex setting doesn't make sense: how does negotiating an Ethernet connection have much to do with whether the computer thinks the device is present?
A common thread in all these complaints seems to be a USB-connected Realtek Ethernet device.
We have the same issue on 4 new Dell XPS 13 laptops (BNX93005)!
We have Philips 34" widescreens with wired ethernet, connected to the USB-C port on the laptops. The ethernet connection drops a couple of times a day, usually during TCs.
Unplugging, connecting to wifi and then reconnecting to USB-C usually works, but sometimes we need to restart.
Seems to be a common issue and Dell needs to provide a solution urgently.
I also have this issue using a usb c adaptor - VAVA adaptor RJ45, keeps losing internet connectivity very frustrating, will try the suggested solution and report back... tx Paul