I had CCTV installed last week and it is motion detected. I was messing around looking at playback and at around 4 am and 10 pm everyday- when No one is in the office the camera starts wobbling up and down erratically and the screen flashes to blue and then back to normal. At first I thought it was a technical fault so the technician from the CCTV company came out and in all her years working with systems she has never seen anything like it. She said the only thing that would cause this would be a large bang on the door or walls. I have double checked with all staff and no one has been in at these times. Just plain weird. Can anyone offer an explanation?