Hi guys. I am having a really strange issues with one of my install sites. For some reason there are 2 of the cameras (big ptz ones) that go offline now and then and they don't come back up immediately. Sometimes they will be down for at least 2 hours or more. They are both dahua. I have also installed about 4 cheap 1080p fuluva bullet cams and they never have an issue. Any suggestions would be greatly appreciated guys.