Polaroid SX-70 Sonar Autofocus problem

So, up until a certain point, the autofocus was working perfectly, then it stopped working once, started again, and now it doesn’t work and seems like it won’t be coming back.

The motor works, and the red light is on at the back. When a film is loaded, everything functions as it should, but when pressing the autofocus button, there’s no response. However, if I lock it, manually adjust the dial, then open and close it, the lens returns to its original position. The camera arrived with a broken Sonar housing, so it might have fallen. Any ideas?