Pretty common on the '13's. IMO it all boils down to QC / tolerance control from whoever makes the parts for the shafts. The bearing should be a press fit and a lot of the '13 shafts were not. Same issue with the QD side being too loose for the glue to hold it together, That piece should be a press fit also before the glue is injected, but the ones that have failed were not a press fit to start with.
The '11-'12 steel hydro formed shaft will fit / work with the QD, but the QD style shaft will not work in the chain case models. IMO they have resolved the tolerance issue and the newer shafts are fine, collared or not.