Have you tried to connecting through wire and disable wifi connection. then change wifi password and SSID. then enable the wifi back again. i use hitron too thats what i did before. read this for more info: (link removed)
Thanks for the idea however when I tried it the device still appeared and its outside my dhcp range. seems as if the router has two ip addresses.
Thank you for reaching out! I am sorry for the delay in response. The forums aren't monitored as closely as our other support channels. That is certainly odd. I'd recommend trying a PIN hole reset with the steps here to see if it gets rid of that device. Let me know how it goes!
Tony | Community Mod.