Hello, beginning of 2018 I bought a Canon 5D Mark IV camera. Previousely I had worked for years with the 5D Mark II and looked forward to using the new camera. Just after the one year warranty had ran out, the problems started to occur. Out of a sudde, in the middle of a shooting, the release button stopped working. The camera was ON, but I could neither half-press the button to focus nor press the button through to take a picture. At first, multiple restarts, changing of batteries, switching to video mode and back solved the problem. After a few weeks none of these worked anymore. I handed the camera first in to be repaired by "Fixation" in London, an authorised service centre for Canon Cameras. First, they replaced the MAIN BOARD on April 26th 2019. During the second shooting after the repair, the problem occured again. Since the repair warranty was still active, I handed the camera back in. On June 11th, Fixation replaced the DIAL ASSY. During the first shooting after, the problem occured again. I handed the camera back in on Sept 3rd. The report said: "NO problem found after two days of testing". I got the camera back and during the first shooting the problem occured again and persited. I am helpess now. The repairs have cost a lot and I begin to loose interest in photographing with my Canon camera. I have been satisfied with Canon during all years of photographing. But this now leaves me puzzled. I do not see the point in arranging another repair, since the camera has been tested endlessly by now. Any ideas how to solve this problem??