my polaroid 636 doesn't shot after first shot

I don't now why but when i puto the film in my polaroid it works as entended then i make the first shot and it works all ok but then i try to do a second and it doesn't is not that the film is stuck is literally doesn't shot the flash ans make no noise but if a take aoyt the film put it in again (obiusly doing thid make the second photo go to wasted) it gives me a new shot but then the follow up also doesn't work i have to waste 4 photos to make 4 photos can someone help me please?? sorry for bad english