I had an issue where the fully threaded "Tension Post Fastener" would catch on a misaligned "Tension Bracket" and at first the axis would appear to lose steps. (
https://www.avidcnc.com/support/inst.../rpDrive/#4318)
I have suggested to the factory that the M8 x 90mm Hex Cap Screw should partially threaded. Something like McMaster-Carr 91310A562 (the threading isn't long enough though)
If you look at the tension assembly on the axis and push down on the head of the bolt (or Tension Post Fastener) it should push the pinion gear off the rack easily. It is doesn't move then the bracket is catching the threads.
When that assembly fully freezes up from the bracket alignment engaging the threads you will get some serious play in the axis.
While I haven't yet changed over to the partially threaded bolt myself, I am waiting for the excuse to do so. When I do I will use a lite machine oil on the unthreaded portion, nothing drippy though.
As of today the tensioner assembly is on my "pre-move" checklist and I watch them like a hawk.