Vector Brushless Motor Problems

[charlie]

We have a New 2 star vector brushless motor which has just broke down, after just 2 months, and precious little running.
The rotor has come loose on the shaft.
This is the third motor that I know of that has failed with a rotor type problem.
I only know of three users of this system making it an impressive 100% failure rate of the maintenance free brushless system from LRP.

Does anyone know of any other similar failures?

Are we doing something wrong? or is there a manufacture / design fault?

We run this in our B4 geared on a 21 pinion 81 spurr