Forgive me if some one already posted this, I looked and didn't see anything so here's my theory about CA hinge failures....

IMHO, It's not the actual properly saturated CA hinge that causes the hinge to fail at the flex line, but an excess of CA that puddles at the hinge line and hardens into little sharp crystals and actually cuts the hinge.

I examined a number of mine that failed last year under a strong magnifying glass and you can clearly see the crystal deposit and can tell that the hinge had been cut, not a normal mechanical wear failure.

To cure this I started drilling a hole in the center of the hinge slot as MINN said and reduced the CA to 3 drops a side. Additionally, to ensure no CA builds up on the hinge line, I mark it with a crayon. Use only GP cut-to-size hinges and cut to 1" x 1-1/4" for 60 size applications, a little oversize, but, hey.

No problems whatsoever.