Hi Decah, when bread rises well initially but sinks down during baking it is generally caused by over rising the dough. When the dough over rises, the structure of the bread is compromised. The gluten strands become weak and cannot hold themselves up anymore, so the bread collapses or sinks. It's very similar to a balloon that's been overinflated. It sounds like your rolls over proofed on the second rise. To prevent this, rise the bread until doubled in size AT MOST, it is okay if the rolls do not quite double. This will leave room for the bread to rise a bit in the oven as it bakes. Happy Baking!

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