I am not sure you know what you are talking about. You don't cure a flu by killing the patient and reanimating him. Nothing similar happaned on 40nm either. If they needed to stop production, then it must have been a different, very serious problem, not just yields. Like machine failure, issues with chemicals, or possibly a dozen of other problems that can happen inside a fab.
SKYMTL reported earlier that AIBs have problems getting Tahiti chips and boards. Could be cause by this pause in production.
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