A few months ago I had an connection from ISP to my house, its cable btw, and had modem > tplink router> pc. During that time everything was fine, but I changed the ISP, and they gave me a modem-router device in one, its a CBN. Immidiatly I tried setting up some ports and somehow broke my own router(tplink) and I got the issue that internet fails until I restart the CBN router/modem. When the connection breaks wifi is also gone. I think that cable are alright because on the same cable is my tv connection hooked uo and its fine when net fails. What could be possibly gone wrong that this modem keeps failing ?