A host of complications like electrical interference, power fluctuations, equipment malfunction etc. can cause CCTV footage to flicker. Do check if flickering is specific to a particular camera or monitor to see if the problem lies there. Check if cables are connected and routed correctly. The source of the problem can be difficult to track and you many need the help of a professional to troubleshoot. Sometimes, it is critical to capture specific moments to unravel a crime and that’s why WD PurpleTM HDDs come with special AllFrameTM Technology that instead of stopping at an interference, simply jumps to the next frame to continue capturing footage.