I'm assuming you say this because there is no hard stop when winding it? If so, you more than likely have a watch with a broken mainspring, or possibly an incorrectly fitted automatic mainspring.
Note that if the mainspring is broken at the end that is out at the barrel wall, the watch may run for close to it's normal power reserve, and in fact run quite well. If it breaks near the barrel arbor, the watch stops running completely.
Cheers, Al
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