CCTV System Damanged Twice By Surge?

We installed a basic analog CCTV system in a residential property roughly 2 years ago. The system was a simple as you can get:

  • DVR with 12 volt plug in power supply
  • 4 Analog Cameras connected with rg59 video and 18/2 power
  • 5 amp power supply with 1 to 4 pigtail to power cameras
  • 40 ft of Cat5e to router
  • 50 ft of vga cord to TV

After about a 9 months of service we had a service call. The DVR powered on but it did not have any form of video output. No Hdmi, vga or bnc. We replaced the DVR under warranty. I suspected a power surge.

We just received service call 2 years after install and we found the following. DVR powers up but no video on hdmi, vga or bnc. All four cameras are dead. No video output.

Both the DVR and Camera power supply's still work supply 12V

On both service calls nothing else in the home has been damaged by surge. What is the likely cause of this. Will installing surge protectors at DVR and inline protection for cameras help?

Just looking for some ideas of what I might be dealing with. Not sure if it matters but the DVR and cameras were IC Realtime (Dahau).

Thanks for any input.

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