Images as planes disappearing or overlapping error

Hi. I have two images as plane on top of each other with Z=5mm for smallest image. When I move the camera away then suddenly at frame 140 the smallest image disappears (or go behind) the bigger image. Scale has been applied for both and clipping set to 100 meters. I have tried to set scene in meters but that does not help. Attaching images and blend file. Any suggestions?



No.6 CO2 Snevert perspektiv.blend (682.7 KB)