If you have a typical installation, where you have access to the first splitter to enter your home, you could install your own MoCA filter, which will solve your security issue, but your neighbor will still be possibly causing interference to your internet. You might be better off doing the MoCA filter install yourself anyway as Comcast will often put the filter at the tap location which is not idea for MoCA on the local LAN.Sounds like that could be it... I swapped the cable modem... no love. Found out the new neighbors have the Comcast Xfinity X1 DVR and units in each bedroom... Comcast never doesn truck rolls for installs anymore. They do auto-hits... neighbors said they picked the units up at the Xfinity store and they hit them remotely.