My structured data graph is going down day by day

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Jackin Mathis: Can anyone help me please?
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  Alan Bleiweiss: Before anyone can even begin to attempt to help you, there are questions that need to be answered. Even when they`re answered, we may not be able to help you, because Google is continually making changes to their algorithms and nobody outside of Google`s own internal search quality and spam teams would know what they have done that might have been a cause. 1. How confident are you that the number of structured data items reported in GSC before the drop, is accurate to the actual number of structured data items on the site? 2. How long had the structured data items count stayed fairly consistent before the drop began? 3. Is there anything you can think of that might have changed on the site either in regard to content, links, or on a technical level, or perhaps on the server, shortly before the drop or since?
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  Yuliana Kronrod: The structured data items count can correlate with the number of pages indexed. If indexation is dropping for whatever reason, Google may be showing less items.
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  David Ogletree: Has your organic traffic gone down. I don’t bother with stats in SC. That thing is useless.
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  Gerry White: Jack you’ve not replied to the other questions... imho it could be improved canonicalisation, ie you’ve got less duplication issues..