The quickest way to access this setting is to perform a search in the start menu for “Edit power plan” (no quotes) and selecting the best match.

In the “Edit Plan Settings” window that opens up, click the “Change advanced power settings” link.

In the “Power Options” window that opens, expand “USB settings” and you should see the USB selective suspend setting.

NB: Make sure to set one/both to “DISABLED”

Reboot the PC to make sure the setting become active