Difficulty with sustained conversations

Difficulty with sustained conversations It feels like the longer I talk the more I stutter/stammer/trip over words. I can handle brief conversations but whenever I have a conversation that really drags on speech goes from a little difficult to absurdly difficult. I might start off barely stuttering/stammering but I find even for light conversations if it goes on too long (like 10 minutes) it becomes increasingly difficult to get my words out. It helps if I take a short break and than continue talking but its hard to hold conversations. I see this in interviews quite often where I start off strong but that crash and burn.