Hi, Thanks for the advice, The power supply is a shared 12V 4A for 4 cameras, I would of though this would have been enough, I also have another camera right next to this one, pointing to the right, it is on a pre-made cable and does not give any trouble at all.
I am only using a single twisted pair for power brown 12V + and brown/white 12V -, could that be giving me voltage/current drop and causing this trouble when the IR kicks in? as I didn't even think about it, I will try to use brown & brown/white for 12v + and blue & blue/white for 12v - and post my outcome. Thanks