I have just bought the 5800H from Amazon - https://www.amazon.co.uk/dp/B0CL4SBD5M?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 - I'm really happy with the purchase save for one issue.
When the PC wakes up after sleeping it loses the Ethernet connection, claiming that there is no cable plugged in. A reboot fixes the problem until the next time the PC goes to sleep.
In Device Manager -> Network Adapters -> Realtek PCIe GBe Family Controller -> Advanced I have tried the following:
Wake on Magic Packet - enabled
Wake on magic packet when system... - enabled
Green Ethernet - disabled
Energy Efficient Internet - disabled
Currently Power Saving Mode is enabled.
In the Power Mangement tab I have also unticked "Allow the computer to turn off this device to save power".
What else can I do?