Recently I added an extra tv IPTV box to my house. When I connected the wired cable from the router to the tv, the signal dropped out from the first wired connection. I have checked my download speed, and although on the low side, 5.5 this used to work fine initially. The router works perfectly using other devices wifi. If I disconnect either cable, the tv set on the other cable works. I have replaced the router 3 times for replacement ones, under guarantee. but eventually, they all have dropped out. I have changed position of the cables to different ports, but to no avail. Does anybody have any ideas what to do. Thank you in advance. Will.b.