Check that the IP address setting on the camera is set to AUTO. It sounds like the camera may be causing an IP address conflict on your network which may occur if your camera has a static (or manual) IP address.
I know this is an old thread but I hope this helps. I was having a wifi problem when I try to connect my iPhone to my 70D as a "Camera Access Point" when I was in the field, for example. It appears the problem of my iPhone not being able to connect ...
