Cat HEUI pump failure

I'm a long time Cat owner with 10 machines. I have recently had 2 Cat HEUI pump failures, and was wondering how widespread this problem is. Cat 324D failed at 4000hrs, and D6R series 3 at 4800 and again at 6800hrs, forcing pump and injector replacement.
According to the dealer, Cat have been attempting to fix the problem by upgrading the bearings in the pump, but the upgraded pump on D6 only lasted 2000hrs, so they still don't have it right?
Apparently, the bearing starts failing, shedding...

Cat HEUI pump failure

Cat HEUI pump failure