Hi TGR land, I've been in contact with Lee about his experience and we're trying to figure out what/how this is happening. These are the same Igus bushings we have used since 2015, and the same set is in every Backland, Backland XTD, and Hawx XTD boot since we launched them.
These Igus bushings are designed to be replaceable should they wear out, as opposed to standard cuff rivets which are not replaceable. As with anything that can develop play, it is best to replace the set when you notice it. The more play that develops can eventually lead to warping mounting point on the shell and then it will be too late, you'll always have play even with a fresh set. Think of it like a headset in a bike's head tube - if you ovalize the head tube, then a headset will never fit properly.
If play is starting to develop, check the screw tightness (get it tight, but no need to crank the sh*t out of it; 7Nm should do it). If there is still play, then it's time for a fresh set.
Frictionless Pivot Set - AZE001164
Attachment 489760