Not an expert but my first thought I’d that you could have had some type of negative emotion that suddenly kick started you back into stuttering. It’s also possible that since you are new to college, you are experiencing new situations where you feel confused about how to behave, such as dating, accepting invitations or declining invitations to parties, etc. Or maybe you are just generally feeling confronted by the new level of responsibility of college. Maybe you’re introverted and you’ve made new friends and are a bit frustrated because you don’t get enough time alone anymore. I also had the thought that maybe since you are in college, you may be putting a lot of pressure on yourself to impress others, such as girls, etc. These are just a few thoughts that come to my mind🙂