Thanks for the advice on the cameras I was wondering about the 2mp ones as they are only slightly more expensive. Before I get the more expensive cams I was hoping to identify what might be causing them to fail incase it's an environmental issue as I dont want to be replacing cams all the time. As I said in my previous post tho I'm hopeful this was just a bad batch of cams. Unfortunately the system was purchased over a year ago and had been sat on a shelf until a recent bout of vandalism prompted me to get it setup, so my only option was to purchase new cams as returning is no longer possible