Night Vision Flashing On/Off

As title references the night vision just flashes on and off repeatedly. Saw previous posts referencing this but no follow up on what solved it. Issue persists regardless of adding more ambient light or less. Not sure if there is a settings issue or something else. Only other thing I can think of is IR reflecting off wall and door to the immediate right? With door open or closed occurrence is still the same.  Update: attempted to reposition camera, add ambient light, change proximity to reflections.... nothing corrected the issue. The IR with night vision is the problem, faulty cam?