Arris TG3492LG-LC errorcode 10

After I left the bridge hanging on the mobile phone internet for several hours, it looks different than usual. But I can’t connect to it anymore if I click on Manage bridge via the app and pressed the button 10 seconds before. What always worked before without any problems. Bluetooth is on and I get a message that no Bridige was found in maintenance mode although the white led of the bridge is blinking.