@nemesyssoft I could be wrong, but the way I understand it, the option can only be on if you’re on their upgraded router, so I’m not sure how this issue is impacting you if you’re not actually on their router with access to the home network security system… Fios might be doing something tricky, or it could be a different router issue.
But, yeah, don’t pay them $12 a month for the upgraded router. If you spend any money on a router it’s almost always best in the long term to buy your own router instead of using the router provided by one’s internet provider — so you don’t have to pay their monthly router fees, so you can get a much better router, and to avoid general weirdness like this. Previously I had a great experience using an old refurbished Apple Airport Extreme router with FiOS, and now the new Synology router I got is working great with FiOS. All the problems I ran into were when I fell for trying out the FiOS-provided router after I’d had the line upgraded. As long as FiOS has the Ethernet-out port enabled on the ONT box (and if they don’t they should enable that for you for free) you should be able to plug any router straight in there. (The setup gets a bit more complex if you’re using a router to connect landline-phone and cable TV to your house, though; in that case the internet provider may require their hardware to descramble the TV channels, or you’ll need to make sure to get hardware that supports it, etc… And with some Internet providers you’ll also need your own modem in the chain — but not with FiOS where you should be able to jack right into the ONT. In terms of typical Internet access, switching out the router should be pretty plug-and-play.)