Thank you for getting back. Can you go back to your Device Manager and check if a power saver option is available?
- Navigate to Device Manager > Network adapters.
- Right-click on your Ethernet connection and click Properties.
- Click the Advanced tab.
- Under Property, scroll down and look for **Save power when system...**or Energy Efficient Ethernet options.
- If you see both or any of the two options, please set the Value to Disabled.
- Click OK.
Once done, check again if Ethernet connection still disconnects when computer is put to sleep mode.
Will be waiting for your feedback.
Regards.