Orchid, I suspect that either 1) you let the dough rise too much and/or 2) the dough is not
sufficiently kneaded. The gluten structure created by kneading traps the gas bubbles from the yeast, but if it is not strong enough or if there is too much gas it deflates.
I have the same problem if I'm making many batches at once and the next batch is risen and ready before the oven is free. It collapses when I move the loaf into the oven. It recovers somewhat, but it's not as good as it would have been if the oven were ready when it was.
sufficiently kneaded. The gluten structure created by kneading traps the gas bubbles from the yeast, but if it is not strong enough or if there is too much gas it deflates.
I have the same problem if I'm making many batches at once and the next batch is risen and ready before the oven is free. It collapses when I move the loaf into the oven. It recovers somewhat, but it's not as good as it would have been if the oven were ready when it was.