diff --git a/IOB-WIN-NEXT/IobSimula.cs b/IOB-WIN-NEXT/IobSimula.cs
index 41968dad..3aa7ed38 100644
--- a/IOB-WIN-NEXT/IobSimula.cs
+++ b/IOB-WIN-NEXT/IobSimula.cs
@@ -683,7 +683,7 @@ namespace IOB_WIN_NEXT
                                     lastVal = item.Value.maxVal - item.Value.factor;
                                 }
                                 // decremento casuale...
-                                float newVal = lastVal - ((float)item.Value.factor * rnd.Next(80, 120) / 100);
+                                float newVal = lastVal - ((float)item.Value.factor * rnd.Next(40, 120) / 100);
                                 // se inferiore a minimo --> massimo!
                                 if (newVal < item.Value.minVal)
                                 {