iPhone x camera black

Hi, I already read the other question about the black camera issue, but my situation is a little different. 4 months ago I dropped the iPhone and the camera stopped working. I thought I’d try to fix it but I was busy in that moment and decided to wait. The following week the camera started working even if sometimes it didn’t, but after that week the camera worked perfectly since two weeks ago. Two weeks ago I dropped the phone, the screen was smashed and the bottom side of touch screen didn’t work. I ordered a new screen and replaced, it worked perfectly but the camera was black again. This time it didn’t seem to work. Yesterday I was about to buy new camera when i dropped the phone again and magically the flash was working while the camera was still black, so I restarted the phone and the camera worked again. 5 minutes ago I dropped again the phone, only the bottom of the phone (the speakers) hit the floor, the screen is a little smashed in the bottom part but works fine… but the camera is black again… So what could be the problem? When i changed the display I disassembled the rear camera to be sure it wasn’t displaced by the drop… so I’m quite sure it is well placed… do I have to replace the camera? How can i now if it’s the rear camera or the front one?