We just got a new modem installed on Monday since the old one stopped working last week. This XB3 gateway won't allow us to connect with any of the 4 ethernet ports on the back like we used to be able too. We use those lines for tvs and game systems to get online which is a problem for us. Any solutions besides the typical reset modem/router stuff, tried like 20 times with no permanent success. Only last for a few min, then it's gone again. Wifi works fine btw, just can't use anything else