The question you are asking is really quite impossible to answer as there are so many possible reasons for this difficulty, including one of "subterfuge" by the purchaser who may have changed their mind about the purchase! however the most obvious one asked by an engineer would be "during the storage period was any traces of water allowed to fall on top of the device?" as this would be one of many things that could cause the symptoms mentioned, and something that could be visually verified in the casing was removed.

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