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You did not identify your system, but I suspect the ethernet card is sleeping or in low power mode
Bring up the device manager network page
Find the ethernet adapter that has the problem
Set "energy efficient:" to disabled
In power management (an adapter setting) uncheck "Allow the computer to turn off the device to save power.
There may be other settings but I need to know the model or the Product ID
If the above does not help then you need to use hibernate instead of sleep.
I am a retired Principal Analyst, and a community volunteer.
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