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I don't think it is common that they break but it is common that they wear out as they are always under stress and tend to loose their strength which makes it difficult to tension the wider resaw blades. The after market springs also tend to be stronger for that very reason
I remember reading somewhere that if you are not going to be using the BS for any length of time to back off the tension on the blade. This will help with spring life, prevent flat spots on the tires and reduce blade stretch. I always back off the tension on mine when I know I will not be using it for awhile and have had no problems with it.