Not common at all Simon, I've got 4 diy's, some made from 1.0 and 1.1 and I'm 100kg.
Did you sit in it with something in your back pocket or lie on a zip from a sleeping bag/ coat? I holed a DD Travel because I left a lighter in my pocket and the sharp point poked a hole.
Pictures would help a lot
My hammock, from the same fabric, has only had maybe a dozen or so nights use, but seems fine so far. I did unpick some velcro off the sleeping bag I use in it as I didn't like it scratching on the fabric.