Yes please inform us about this I have been having some similar issues.

I got a set from ABEC35 a while ago which were great but with recent orders the diff has lasted 1 meeting only. It could be that the power we have now is much more than just 1 or 2 years ago (1/10 stock TC), which it is, or that the quality of the ball is not good. I don't know which is the answer.

Some of the guys running the T3'11 at my club have suggested that the diff plate material on recent xrays is poor and the diff doesn't last, and if they use the old T3 diff the problem disappears..

I prefer the feel of the ball diff over the gear diff and don't want change but the reliability seems worse than before.

I get 3 or 4 runs with the 417, 20 runs with the T3'11