求翻译：金属キャップの劣化の原因については、製造所からお客様に届くまでの輸送及び保管時になんらかの衝撃が加わったこと、あるいは、高温下に置かれたことに起因すると推定したが、具体的な原因の特定には至らなかった。是什么意思？

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Concerning the cause of deterioration of the metal cap, until it reaches from the plant in the customer, it presumed that some impact joining when transporting and storage, or, it originates in being placed under high temperature, but it did not reach to the specification of concrete cause.

Was presumed due to transport to reach our customers from the mill on the cause of the deterioration of the metal cap and store at joined some sort of shock, or placed under high temperature and did not identify a specific cause.

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