Very simply, here's the recipe for whole wheat bread that I've been making for years:

1.25 cups water

1/4 cup honey

1.5 tsp salt

2 tbsp canola oil

3 cups whole wheat flour

1.5 tsp yeast

1 tbsp vital wheat gluten

I've produced dozens of 1.5 lb loaves from this recipe, using my Williams-Sonam bread machine that's now 3 or 4 years old.  The bread is wonderful.

But the last six loaves have all been half-height, making them dense and not so tasty.  I've bought new yeast/honey/gluten/dough with no change.  Could it be the machine isn't generating enough heat?  How could I tell if this were so?  Any other suggestions on how to track down the problem?

Many thanks!

Whole Wheat Guy