@Philbert Good evening, it's seems that the problem is solved. and at this point I really belive that it was a ISP problem. I haven't change anything and the connection came back alone... Anyway...

@Philbert Hi, I'm not using a modem, because this model has a modem integrated . I log into 192.168.1.1 .I have tried to connect the wire directly to the phone when the router told me: check you...

Hi there. The modem is telling me that the cable is not connected. I did few tries and the cable is good and there's signal. But the modem keep is saying : verify that the cable is connected. Any...