Signal loss every minute for a few seconds using Blue Iris

My cameras are Dahua qsee 7001b, with dedicated 12 supply ( not POW). Unspliced Cat 5e cables about 100ft. Using Blue Iris, with all cameras set to a fixed IP, same for computer. Main Router IP is 10.0.0.1, cameras range 10.0.0.70:85 thru 10.0.0.75:85. Each frame of Blue Iris displays date/time stamp. This time stamp displays time in H:m:s, and scrolls every second. About each minute or 90sec, the time stamp stops and freezes for about 20 seconds following a loss of video signal of about 1-3 seconds. This occurs on every Dahua camera. I have a Hikvision DS-2CD2032 hooked up and this camera doesn't lose the video. Any ideas?

My cameras are Dahua qsee 7001b, with dedicated 12 supply ( not POW). Unspliced Cat 5e cables about 100ft. Using Blue Iris, with all cameras set to a fixed IP, same for computer. Main Router IP is 10.0.0.1, cameras range 10.0.0.70:85 thru 10.0.0.75:85. Each frame of Blue Iris displays date/time stamp. This time stamp displays time in H:m:s, and scrolls every second. About each minute or 90sec, the time stamp stops and freezes for about 20 seconds following a loss of video signal of about 1-3 seconds. This occurs on every Dahua camera. I have a Hikvision DS-2CD2032 hooked up and this camera doesn't lose the video. Any ideas?

Increase the receive buffer to 20mb. camera properties>video>configuration

It sounds like you may be having bandwidth issues. Try reducing your framerate slightly and see if that helps, but the previous post about buffer size is a good suggestion as well.