I would blame the engenius AP, they are made for consumer home use, not so much for commercial and certainly not good enough stability for streaming video. I had them in my own house for internet AP and was rebooting every few days until I set them to auto boot daily at 2AM, I finally replaced them when they occasionally needed to be powered down and up to reconnect.
I just installed a few VideoComm wireless units on a site with multiple IP cameras. They only need dip switch setup, no computer. work great and have had no issues last 2 weeks. just a thought, take a look at them VNO-58D150 http://www.videotransmitters.com/Products_List/up-to-3000-feet/VNO-58D150 . Most distributors have them or can get them.