After years of not stuttering, it came back.

After years of not stuttering, it came back. A little back story to start off. When I was in high school I had a terrible stutter and it really made it hard to have a social life and friends. When I was around 21 or so my stutter went away, not completely but mostly. It got WAY better than it was in my high school years at that point. I am now 28 and recently have started stuttering a decent amount again and I'm really not sure why after all these years of not. I recently have had a few major life changes and it could be related to stress I guess. It's just odd to me that it got so much better for so many years and it's all of a sudden come back. Anybody else ever experienced anything like this or have any ideas to why it would happen? I was talking to a friend on the phone the other day and I could barely get my words out, my stutter hasn't been this bad since I was probably 17 years old.