It is interesting to note that, I brought this camera into the house yesterday at 3:00 p.m. I am using the same PoE, but different cable from the PoE injector to the camera, and the camera has remained online. I know the outdoor cable tests as good, so, I'm not sure what's going on...... The other camera was having problems in the warm summer months, so, I am not sure if it's the heater, or not. My next guess could be the port on the D-Link switch.
I did not use a PoE switch, because I already had enough Linksys switches, so I figured the PoE injectors were the cheaper options. I almost bought a D-Link PoE switch, just to try it, but I guessed that would not resolve the problem.
Thanks for your help!! If you think of anything else, please let me know.