@Bogle What exactly do you mean by "save it?" I turned on the Wi-Fi and saved it many times. I even did a factory reset, set everything, and saved it.

@Marvin_S I have five of these devices, but only two of them have the latest version. One shows these problems, while the second works without a problem. With the latest version, it is mentioned that...

@Marvin_S Thank you for the reply. It is already a few months after the warranty ends. I was wondering if it was somehow related to the firmware version. I have more of these routers, and I think I...

@Marvin_S Did you somehow manage to solve this problem? I have exactly the same case. My wifi randomly turns off (both 2.4, 5). I tried resetting the router to factory settings and it didn't help....