With the drastic temperature changes the cameras are exposed to each day, the thermal expansion and contraction of the circuts will eventually have an effect on a connection somewhere. My Blackvue 650GW rear camera gave up at about three years, the main camera is about four years old and may have passed on now. Still need to check it out. My Thinkware F770 is three years old and starting to act up a bit now. The cooler mornings it fires up when the car starts, the hotter afternoons it takes an extra five minutes to power up.