Do you / are you using the router supplied by your cable company? If so, their maybe some conflicts. I know that when I set up security cameras, WIFI and Via Internet browsing, I had to make adjustments to the supplied cable modem / FIOS modem. I needed Tech support to help me open up the right ports which eliminated the conflicts when using the supplied applications.
I have not played with WIFI from either manufacturer so what I mentioned may not be of any assistance. It could be causing a conflict.