Axle shaft problems
Sounds like you need to buy 2 axels and bearings, not a hard thing to accomplish, if that of course is ALL that is wrong.
Three failures on the axle race is not defective axles theres something else wrong here. Impossible to guesstimate without taking a look at your set up back there. Maybe some components are rubbing/misaligned etc. etc. etc. It could be a combination of things. More info needed
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Makes sense now. My guess is when the first set up went bad the shaving spray that comes off the grinding parts gets stuck all over the inside of the axle tubes and whatnot. Most important thing on internal repairs is to clean all that crap out or it will only happen again... which is what sounds like happened to you.
All those shavings and chunks flying around in there will wreak havoc on bearings in no time. It doesn't take much... For safety sake you may want to stick a magnet on either end of the axle tubes just in case. I believe all the stock covers have a magnet but regardless cant hurt to stick more on.
One year warranty is decent... I would guess again if there are going to be more troubles they will show up sooner rather than later. Best of luck



