This could indicate (a) an issue with the grommets (plastic tubes which form the grommets may be damaged and grommets must be replaced), (b) defective batch of the strings, (c) something wrong with the clamps used on the stringing machine or the tensioner gripper, (d) a player who got so strong that he breaks the strings and needs more robust strings, like poly. Just as "United breaks guitars" {if this joke does not ring a bell, search for these keywords in youtube, you will enjoy it}
(a) seems to be on top of the list of possible root causes, followed by (d).