I guess that because the bearings are at a fixed angle relative to the rotating disk it will never be a perfect movement-match, with always a slight angular slip between them. I wonder if a squirt of a dry lubricant like WD-40 teflon based dry-lube on those bearings from underneath would extend the life of the disk.
It looks like one or more of the bearings got stuck at one point in time. It might spin freely now, but better to replace them when you get your new table piece.
