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    It really amazes me that they even provided replacements that still had the same problem… it makes it look like they don’t know what they’re doing at all.

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      Engineers under pressure thought they’d found the issue and turned out they hadn’t. Or maybe even they did find and eliminate one of the causes, not realising there was another issue that resulted in a similar failure mode. Many of us have been there (though hopefully in cases where the consequences were less severe).