Hi

My house has 8 cctv, all connected to one decoder. The problem is, the wiring for these cctv keep on going kaput (not sure the power supply or the video wire), one after another. From the original 8 cctv, now only 4 cctv is working (the other 4 has 'video loss' displayed). I can confirm that the cctv still works, because if I detach the cctv and put it on another place, it's working fine.

Not sure what's the problem though. The wiring is only about a year old. All cctv are located outside my house. I remember that the 3 cctv gone 'offline' few days ago (when it was heavy rain & thunderstorm). Btw I checked the wiring at the cctv end, nothing seems wrong. Even the cctv is still ok... so if somehow the petir renders the wiring kaput, how can I check it?
Thanks