Zyxel Keenetic Start works for several minutes after turning on, how to cure?

Question

network hardware

Bottom line: There is a Zyxel Keenetic Start router in the apartment, an Internet cable is connected to it and nothing more. After starting, the router works for about 10 minutes, then either it hangs, or something else - the power and Wi-Fi indication is on. Does not enter the Web-muzzle. At first I sinned that the old updates were standing, restarted, quickly went in, updated (did not change the firmware). It still crashes after 10 minutes. What could be?