Realtek 2.5Gbe RTL8125 NDIS Reset Problem

I've being having this problem as well.
Gigabyte B550 Pro ac motherboard.
Ryzen 7 3700K and GTX1660Ti.

It seems to be ok now. Here's how I fixed it (I hope).
Update your driver to 10.43.723.3030.
Windows10 also did an update on 8/09/2020: Realtek Semiconductor Corp. - Extension - 6.0.8945.1

Open Driver Manager
Right click on Network Adapters --> Realtek Gaming 2.5Gbe Family Controller --> Properties
Open Advanced tab.

Set the following:
Energy-Efficent Ethernet    Disabled
Gigabit Lite               Disabled
Green Ethernet              Disabled
Maximum Number of RSS Queues 4

Go to the Power Management tab and turn off 'Allow the computer to turn off this device to save power'

Click OK and reboot.

I have a similar issue with my B550 Steel Legend.

The connection stops every then and now, without any noticable errors whatsoever. I have to reset my Ethernet, or unplug and replug my ethernet cable. Otherwise i can sit for hours and wait for it to work - which won't happen, because I have to reset it manually. This is so annoying and frustrating when watching videos or downloading large updates.

I did disable the power management stuff on my ethernet settings.
Never had this kind of issue with my B350 board from MSI.

I tried LAN driver 10039_03232020 from the Asrock page and 10.043 from Realtek page. No difference at all. It's all the same.

Please fix this issue.

Just registered here to share a similar issue.

Having the same issue here, RTL8125B, using a third party 2.5gb ethernet card as my MOBO ( z170a gaming pro ) only support 1gb.



Plugged using an Ethernet cable, getting multiple disconnect everyday, it usually last for a second or trwo and then it come back all by itself, while it's not a big issue while browsing, playing online is something else as I get kicked out of the game everytime.



I also noticied that the more load my internet is having (like playing + discord ) the more this will happen, it can happen 6 to seven time in half an hour FFS.



I tried every realtek driver I could find, from the legacy one that windows install all the way to the latest one, and others in between, tried every settings, disabled every energy / green settings, and nothing helps. Thinking about buying another ethernet card powered by Intel driver, more expensive but hopefully it'll work as Realtek can't get their sh*t together.

readyy wrote: just created an account to help out my fellow gamers! :) in the reddit post earlier there was a link to a new driver from realtek for now it seems to work perfectly. here is the comment: https://www.reddit.com/r/MSI_Gaming/comments/hsmz3x/random_connection_lost_with_realtek_pcie_25gbe/g99mpns?utm_source=share&utm_medium=web2x&context=3

I tried this driver but I'm still have random disconnect :/

Since google leads to this page, I'd decided to share my findings.
x570 tomahawk also has this controller and also has this issue, but it only surfaces when I use curve optimizer to decrease CPU voltage. For almost 2 weeks it didn't appear a single time when running stock settings, but happens every ~20 minutes if I set curve optimier value to -15 for all cores (I don't really know what the measurement is), which results in ~0.05V drop for vCore. I really don't know why it affects the LAN, as it doesn't change BCLK, but somehow it does.