There might be something very specific about how your dress/look/demeanor for this to happen so often. The next time you are stopped make sure that you ask very specific questions as to why you are being pulled over. That may help the police realize that you are not a person of interest... In fact, offer to meet the police officers at the station (at a later time) so that you can get to know some of them. Once they know you they will only pull you over to casually talk and notify you of imminent danger...