No, been building and shooting, 8, 10 and 12 strand strings since the beginning of the year. Haven't heard of any such breaks or problems, and have alot of folks shooting them.
Any material can fail. If "man" has a hand in it! I'm not shouting from the roof tops, I still shoot about the same!
If your breaks occured in the same place, most likeley happened in the building process or your equipment.
Bad material? Maybe. Call and ask.
I built a D-97, 12 strand, last summer, for a 55lb, BBO. Shot it alot and killed a doe, 2nd week of October. Week later, going to stand, noticed a fuzzy area, halfway up the string. Checked and found 3 strands broke!
Why? I don't know. I'm pretty aware of my surroundings and equipment!
Does this mean Dynaflight is bad?
Good shooting,
Steve