Why does the device reset the Wifi connection?

Question

network hardware

Apple Time Capsule 3TB is connected to the provider's main router via a network cable and a wifi network is created on the capsule. When connected to it via a wafer, the connection lasts a maximum of half a minute, then the connected device reconnects, but with IP 169. *. As a result, there is no Internet on the connected one. In the interface of the provider's router, you can see that the device has connected with IP 169.*. The computer is connected to the capsule via a network cable. His connection is stable. It is with the waffle that the problem is. Where to dig?

Answer 1

All you had to do was to manually select the radio channel from wifi. Since the antenna capsule is weak and neighboring routers interrupt the channel. And better, in general, do not use the capsule as a Wi-Fi router in an apartment building.

Answer 2

Is DHCP configured on the capsule?
Does she know how to give out IP addresses?
Router does not support WiFi? Why are you not connecting to it, but to the capsule?