Have you by chance switched types of yeast, i.e. from active dry yeast to bread machine yeast (fast acting or instant)? Instant rises faster and so it's possible it could be rising too much and collapsing.
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Have you by chance switched types of yeast, i.e. from active dry yeast to bread machine yeast (fast acting or instant)? Instant rises faster and so it's possible it could be rising too much and collapsing.