Mine fluctuates between periods of being extremely bad (which it is just now) and periods of being much better. It is very frustrating that I can’t figure out what causes this. I used to pay attention to how much sugary products I ate, coffee I drank, alcohol intake etc., but have never been able to find anything. Many stutterers acknowledge this problem though. Think it is just a natural part of having a stutter and likely does not have a cause.