Just had xfinity service installed a few days ago. Initially didn’t have a tv receiver for my downstairs tv, but have since added one. That outlet is also where the gateway is connected so I had to add a splitter (xfinity issued) in order to connect both the gateway and x1 receiver. Now internet is lagging in my son’s room which is the furthest point from the gateway. I can only assume this is due to the newly installed splitter. Is this a common occurrence, or is there something I can do to improve the signal to my son’s room?