Netgear C6300 setup

I purchased this Modem/router about 2 years ago, my IPS provider is TWC (Spectrum), my desktop PC is Windows 7. A few months later I was trying to access the VIA apps on my VIZIO TV, and it shows that I have no internet connection, telling me to go to Network>Setup. I did tried both wifi and ethernet connection, it shows that I am connected, but when I try access any of the apps sends me back to Network Setup. I called VIZIO, they suggested a hard reset, and some other things but nothing changed. Yesterday I called Netgear Tech support and I was told that my router isn't setup properly and I have too many conflicts within the router, possibly caused by too many security apps conflicting with each other, and they can fix it for $150. I told them that's kinda steep, and I've been living with this issue for 2 years now, it would be nice to have it work again but it's not worth $150 for me. I deleted all my security software, I kept only 1 but the issue still persist. I am contemplating a factory reset and try to set it up again, but I would like some Input from this community and suggestions how to proceed. I would appreciate any suggestion specially from people who are familiar and dealt wit this issue before. Thanks in advance