Sharepoint Forms issue

Hi,

I am creating a form through infopath which works brilliantly however i want to have these filled out forms to be saved into my document library and have set the submit options to send it there however I have a feeling that there is something i may be missing because it only allows me to fill in the form onceand save it. The next person can fill the form and is unable to save it to the same location and i think its because the name of the file is the same. Is there a way where this file can just be incremented so that all forms can be stored into the same document library?