BNC signal degradation
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I would double check your Cables and make sure you are using a good power supply. Normally this can happen because of a Ground Loop. I would make sure that your cables are away from the DVR and that they are not crossing over any Power wires in the Security Closet or in the locations they are ran. If lets say you have your cables running in the attic laying over your house wiring it could be picking up that. In that case best to pull wire up over the house wiring and tack it away from any in wall areas shared with house wiring. In some cases pulling new Cat5e wire and using BNC connectors and power connectors are only option as it cost less then quality RG59 as the Pre Made JUNK is just that JUNK.. If you have a cable that isn't in use do a Continuity test with a Meter from your power wires Ground to the VIdeo Ground. Pre-Made wires normally use shared grounds and that is bad for a good security system setup.
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Silicone can be an insulator, not a conductor. If you're having connection problems, you should get a good contact cleaning spray and clean everything off. Then, if you have a wet environment that might encourage corrosion, you should consider using a conductive grease, like NO-OX-ID - applied SPARINGLY to the center contact and ground connections of the BNC's. A little NO-OX-ID goes a long way!
James N is correct that the orientation of your video cables and AC power lines is important, too. Video should be at right angles to the AC, if possible, and if not, as far away as possible from the AC to minimize AC coupling into them. If you happen to live near any radio or TV broadcasting towers, they can also couple into your system, and that's a much harder fix.
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