Signal between two Camera's

Smokey

On the corner of my garage, mounted in the front is a E1 outdoor. Around the corner of the garage is a 510A. Both are wired and powered with ac adapter. When looking at the camera's for the first time each day with APP the 510A camera loads twice on app monitor. So I reboot 510A camera and then the E1 outdoor appears along with the 510A camera like it's suppose to. Telling me 510A signal is stronger then E1 outdoors? The fact I am connecting to both camera's wirelessly to monitor could that be why? When I use the client everything works fine because no wireless is involved. Does anyone have suggestion how to fix this problem other then moving camera's further apart from each other. Because 1 inch hole and screw holes would be exposed. Maybe use a dvr or a managed poe switch? I could use some advise here!