Did you review the past discussion I had with this issue in this thread?
They are primarily configured with the Automatic Set-up utility and I was using the TP Link PoE injector. Now, I am using a D-Link PoE Switch. I live in the Chicago area, which is not extreme weather. The cameras are in the shade and protected from the elements, rain, snow, etc. I am using D-View Cam and the D-Link cloud to view them. I am using a SanDisk Memory card 32mb in each camera, also.
Anything else you can think of?