When connecting via wifi to the Internet, after a while, the router is restarted (TP Link TL-WR 740N). After a few minutes, the Internet connection is restored. It repeats after a certain time. Note that no matter how the devices are routed to the router Even when the tv box is naked, it comes to restarting. During Internet connection, the Internet is stable, ie there is no restart of the router.What is the problem?