Cameras on the main router is the old configuration.
I had many problems of disconnection with cameras on the main router.
It's for the reason I pass by another AP. With a Trendnet or my D-Link, I have no problem of disconnection. Sometimes The camera at the 1st floor disconnects. But with the two others cameras I have not disconnection.
I have interchanged the camera 1 and 2, and I have the same problem on the camera 2 at the 1st floor.
With the 2 cameras in the same room of the DAP, no problem.
The 2 cameras at the 1st floor, sometimes the cameras freeze.
It's the same problem in 2.4GHz and 5GHz.
I have between -70/-80dbm at the 1st floor.
That is why, I think changing the antennas.