port flapping problem gone.
Well since there is a switch between the router and the camera you cant tell if the port flapping is gone… Your RB has its port connected to the switch that actually does not cause any port flap to the Router… Then the camera is connected to an unmanaged switch that even if the port flaps you would never see it since it is a simple unmanaged switch…
Am not sure what camera you use but the problem could as well be there…
Remove auto negotiate and set the speed rate to 100Mbps full duplex… And give it a try…