The movement does not wind up

Hi,
I’ve finished assembling a pilot watch and I’ve got an issue with the movement (MIYOTA 82S0).
I have tried winding it up for quite a long time and it does not stop : I mean that once the spring fully wound I should not be able to move the crown.
Furthermore, when I wind it manually I can see the rotor turn around…
At last, even worn every day, the watch stops after 48hours and has to be wound manually.
How can I solve this issue ?
Regards
Thierry