I've only had one hinge break. When I looked at it with a magnifying glass it looked like I used too much thin CA, and the extra turned into tiny razor blades cutting the hing after use. I now use the CA sparingly, drill a small hole in the center of the slit, and clear away any covering near the slit. Have planes that are ages old with no issues.

I did have an issue with Great Pains hinges de-laminating though. I quit using the GP ones ages ago. My buddy just had his elevator fall off in flight last week due to de-laminating hinges. Guessing they were GP ones as they came with his UcanDo Kit.