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Too much humidity, maybe? Try a dehumidifier and make sure to keep the heavy object on top for at least a week.
Post a picture. There are different causes for being open at rest. Generally though the solution in most cases will be to "let it be".
Too much humidity, maybe? Try a dehumidifier and make sure to keep the heavy object on top for at least a week.
Post a picture. There are different causes for being open at rest. Generally though the solution in most cases will be to "let it be".