Bearings falling out of rhino plates

[bfk]

I noticed that after running our Rhino drivetrain around for a little while that the bearing supporting the drive shaft on the outer plate has slipped along the shaft and was no longer giving any support. The bearing could be easily pushed in and out with finger pressure. The flange is on the inside so the bearing ran along the shaft rather than fall to the floor. Looking more closely we saw that the bearings on the inner plate were also very loose. This happens on at least three of the four rhinos we have.
For the drive shaft we can add spacers and there's always Loctite, but has anyone else seen this?