Recently we bridged our AX11000 to our Xfinity Gateway and we had a breach. Someone nearby had stolen our original Gateway equipment when it arrived at our new address before we did. When we went to Xfinity to get new equipment they said the original equipment was activated at our address. They opened an investigation but they never deactivated the old equipment. We used just they Gateway for awhile and then decided to bridge our router to it because we use a lot of smart home devices and wanted the coverage. Suddenly our passwords were being changed and someone even came into my yard and tried to send video to my TV. Subsequently, we called Xfinity and they had to change our WiFi password over the phone. The next day a technician brought us a new Gateway. My question is; did the security in our router fail allowing this creep to get into our system or did us hooking it up to the Gateway which apparently was account connected to ours give him a stronger signal to be able to change settings? If we hook it back up to the new Gateway, will he still be able to access our system? All firmware tests up to date.