Sagemcom F@ST 2804 V7 Rev.1 routers do not distribute the Internet

Hello! When configuring Sagemcom f@st 2804 v7 rev.1 routers, I sometimes encounter a problem that appears to me after resetting the settings to default. The problem is that the router itself establishes a connection, but not by cable or Wi-Fi internet does not give. In bridge mode works normally. The settings are all typical, standard, ie 9 out of 10 such routers work normally. Other versions of these modems do not have this problem. Thank you.