A computer on the second floor insists on shifting to the main router (on the first floor) rather than the secondary router (in the adjoining second floor room). When I reboot the computer, it goes to the nearby router and streams fine. But after a few minutes it switches to the 1st floor router, after which it stops streaming and the computer says it has no Internet connection. Is there a way to force the computer onto the 2nd floor router? Or do I need to move the secondary router to the same room as the computer and do an ethernet connection between them?