Great question — answering as the UphillTech team:
Given that this is impacting both OSes, this is unlikely to be a driver issue. While DavidGo says it is not a Router issue, it is probably worthwhile connecting to a different internet router just to see. Assuming this IS an issue local to your computer, and knowing it is not a driver issue, that leaves you with the following steps: Update all possible system firmware. This will include BIOS/UEFI but should include any other available firmware updates for all your system components, especially mainboard components and your NIC. Reset your system firmware to defaults, then reconfigure to any required settings. Connect and use a USB NIC dongle. These are cheap and easy to use.
Full answer by music2myear: https://superuser.stackexchange.com/a/1939180 (CC BY-SA 4.0).
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