This also happened to my 1/8 F16. I fixed it by epoxying kevlar cloth to the inner aspect of the hinge line in the split section. Only use 5 minute epoxy as it retains a degree of flexibility. So far so good. I would be interested to know if anyone has used silicon as the adhesive with good effect.

I am not a great fan of the live hinging for this reason and check mine regularly before flying.

Craig.