Probably one of the following:

1. The frame is warped (check with a long straight edge against both the jamb and the facing).

2. The frame and door are not level (check with a bubble level against both the jamb and the facing).

3. The door is warped (check with a long straight edge).

4. One or more hinges are are not prefectly square with the door and frame. (the hinge pin must be perfectly vertical).

Regards

if the door works fine put a door stop under it . something as simple as a draft could be making it close. when it comes to doors, ..if it isn't broke don't fix it.

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door hanger 26 years.