Setting up a new modem from xfinity and before I has connected any devices there were 5 devices by the name CTDI CMTX
And had the icon of a router I've been having problems ever since saying my smartphone is connected when I'm not even home also it renames the devices connected as I have a Samsung a53 and it renamed the device to SWDK3560 and I wastnt even connected to the network yet. Also my wife's iPhone connected to the gate way at 3am and she her device wasn't even near the area I mean she was at least a few miles away so Comcast seems to do nothing about my situation but tell me I need new modem. Got the new modem and same thing happened. Please let me know what I can do to fix this it's a bit of a hassle and I feel not secured enough I've tried VPN and it doesn't seem to stay on and random settings are always being changed. I'm in need of some serious help..