My LG G5 main rear camera was having focus issues. That seemed to be a pretty common issue, so I ordered a replacement from ifixit. I put the new camera in, but now the camera app won't even switch to the main camera. The wide angle works fine. I took it apart again and re seated the cable to make sure it was all the way connected, but it still doesn't work. The camera app force closes every time I try to use the main camera.