USB LAN Issue on Apple macOS Catalina (10.15) / Big Sur (11.0)

1. The Issue

Having the LAN adapter connected while in Sleep Mode causes network slowdowns due to a bug with the USB LAN adapter's OS built-in network driver.

OS : macOS Catalina (10.15), Big Sur (11.0)
Monitor : FlexScan EV3895, EV2795, EV2495


2. Solution

To avoid this issue from occurring, shut down the computer instead of switching it to sleep mode when using the USB LAN feature.
This page will be updated when a fix for this bug becomes available.