A mining issue audit is part of a real-time summary section and available under the summary tab in the diagnostic. It shows the number of workers with a specific issue: missing hashrate (or hashrate speed 0 H/s) and low efficiency (efficiency smaller than 98%). The more mining issues you have in regard to the total number of workers, the lower the grade.
You can improve the mining issues grade by reducing the number of issues. This includes the following fixes:
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