I normally hear of such unfortunate stories from newbie or inexperience stringers. The damage normally occurs at about 2/10 o'clock ... near the cross towards the top of the racquet frame eg breaks just when you are nearly done!!!
The main reason is because the tension calibrated on some stringing machines are raw values eg pulling a tension calibrator directly.
However on other machines, the tension could have been set higher than what has been marked to produce the desired tension within the racquet frame - refer to the Japanese author webpage. Hence it is best to have a tension calibrator or digital fisherman's weighting scale handy to verify the tension produce by your machine for a given setting (after purchase).
In addition, the difference for a given tension within the racquet frame vs outside the racket frame has been demonstrated by a Japanese author on his webpage. Even though the Japanese author demonstrates with a tennis racquet, the difference applies to badminton racquets as well. Hence if the desired tension was close to the maximum and you had to add extra tension to compensate for your stringing machine - you risk damaging the racquet!
In all my years of stringing, I have not damage (... touch wood!!!) any racquet yet.
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