There are many variables that can affect your starter. The first thing to check is your flour. Is it unbleached? Is it the same flour you have always fed it or the same flour it was started with?
Next, check the water being used – is it treated with chlorine? If so, change it for spring water or allow the chlorine to evaporate from your water before using it.
If your starter is too cold, it will not rise as fast.
If none of those variables are the cause, you may be feeding it before it’s hungry. If this is the case, give it a rest for a day without feeding it.
