Don't know about 8 times around the world, but my business mileage is equal to about 80 times around the world on one airline alone, and the vast majority would be on Boeing aircraft, especially all of my foreign destination flights (commercial that is) and I'm not too concerned.
If it's true or close to the truth then there's got to be more going on here than meets the eye, and as an old cop and as an old aviation QA/QC guy for a "minor" aircraft company among other things, I tend to get suspicious over time about things and in this case like this my suspicions would lean towards shoddy workmanship and even more shoddy inspections, I could be wrong. Granted, I've never worked in manufacturing or on aircraft this size (my biggest would probably be a CH-47 or CH-54), but, there's just no accident in continual problems, a funky paint job or smiley face on a rivet now and then yeah, but not stuff like this.