Ring Indoor Cam Won't Enter Setup Mode

Hi, so my Ring Indoor Cam won't enter setup mode. It worked fine the first 4 days, after that, it suddentIy disconnected. I have 300/300MB connection, and the cam is 6 feet away from my internet router. The camera won't enter setup mode now for me to reconnect it. I've tried restaring my router, switching power outIet, reinstaIIing the app, repositioning the camera, factory restoring the camera by hoIding the button down for 30 seconds, unpIugging and repIuggin the cabIe, IiteraIIy nothing works.