Only once in almost a decade. I purchased a 40 lb box of leftovers and one leaked. That was one bag out of the 8 in the box.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk