I cannot use xfinity wifi at my home.

About two days ago, I cannot access to xfinity wifi at my home, apartment. As I remember there a lot of rain and the next morning, I cannot use the xfinity wifi which I've been used for a year. A strange thing, when I go out to the hall way where is still in the appartment, I can access the wifi, but again lost IP address and no access in my home. I've been joined the xfinity internet service for a year and I was using the wifi as a xfinity user. How can I fix this situation and restore my service which is deserve for the paid user?