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Realtek PCIe GBE Family Controller keeps disconnecting - my fix.
So I had this issue where my ethernet connection on my Lenovo B570 laptop keeps disconnecting about every couple of minutes and the link lights would turn off then it would reconnect. So I did the following:
visit Realtek and install the latest driver. (Might not be necessary but do it anyways)
open Network and Sharing Center, click on Manage adapter settings, right click Realtek PCIe GBE Family Controller (Local Area Connection) and select properties. Click on configure, switch to advanced tab and change the following properties:
Auto Disable Gigabit > Relink Battery or AC
Green Ethernet > Disable
Energy Efficient Ethernet > Disable
My ethernet connection has been stable so far.
Hope this helps anyone. :)