Shrinking hostas

I once had many large hostas around my property but most now have shrunk to a tiny size or disappeared altogether. Most were just dark green, but even some variegated varieties have met the same fate. Deer used to get to them but they would come back as strong as ever. No signs of slugs or holes in leaves -- just shrinkage and a disappearing act. Has anyone else encountered this problem? Any ideas about causes and solutions? I love hostas and am sad to see them go.
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