Mobile phone doesn't connect to Gigacube?

I have the problem that sometimes I can't access the Internet with the Wi-Fi. My cellphone says from one second to the next that my Gigacube has no internet connection. To be able to connect to the Internet again, I have to restart the Gigacube. In the meantime, this almost always happens twice a day. Neither my parents with their smartphones nor I with my laptop have a problem, it only affects my cell phone (Samsung A70). Does anyone have any idea how I can change this? In the long run, turning it on and off is annoying for my family.

Maybe reset to factory settings. Then went with me again