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The only way you will have video loss is if someone
1. Unplugs the video/power feed cable at the camera or at the DVR
2. Powers down or unplugs the power cord to DVR
3. Turns of the breaker to the camera system
Is the video loss at ALL the cameras or select cameras. If select cameras they got a way to just disconnect certain ones.
What cameras are these? Pelco? Q-See? What is the connection? Cat5 cable and baling converter or Siamese RJ with power cable? Or are they running off plug in transformers?
First thing I would lock your electrical panel door. This will stop them from turning off the breaker.
Check to see if the cameras were accidentally hooked up to a switched power outlet. If so either rewire it or find the switch that's turning them off. Pull the switch and connect the wires together with a wirenut. This way when they turn off the switch they think the CCTV is off.
Basically they figured out a way to either turn off the cameras or they are unplugging them at the back because the position is bad and they can walk up to the camera and pull the power wire.
You can get cameras that are wireless and look like smoke detectors or lights. A buddy of mine used to cameras that look like motion detectors but have a CF card that takes pics every time the motion detector is activated.
Another way that there is video loss can be from inserting a small pin (think needle) into the camera output wire to the recorder. My father had issues with my ex-stepmother breaking into his house and his cameras not catching her. He finally installed a field cam across the yard and caught her going to the cameras in question (can go under them to avoid contact) and messing with the wiring. Upon closer inspection when one didn't come back on he found a sewing needle sticking out of the video feed cable. When he removed it, the camera began working again.
Might be worth checking to see if there are any pinholes in the cable sheathing anywhere.
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