Happened to me 25 years ago. Was Told to lubricate the spring annually with WD 40. Been doing that ever since although I now use motor oil. Have not broken a spring since.
With age the spring rusts. As the door is opened and closed the rust results in extra stress on the spring as it coils and uncoils finally causing it to break. Have never had a spring break since I began lubricating it.
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