Hi Chris,
So someone had done a tapered bearing conversion on your car. These bearings require a small amount of pre-load when being tightened. The original ball bearings fitted could be tightened up as hard as you like but not so with tapered bearings. In my car, we fitted a spacer between the inner and outer tapered bearings and adjusted the width of this spacer so that the bearings had a small amount of pre-load and nothing more. Perhaps yours were tightened up with force which will cause the bearings to overheat and fail.
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