Looking for some advice on an intermittent x axis fault

[ZASto]

Hi John, yeah it is a little frustrating. Thanks for your suggestions. I've tried swapping the stepper with one on the y axis already which didn't work so I think I can rule out the motor itself. I can turn the ball screw all the way fairly easily and I can't see any damage to the screw but considering how random it is maybe something worked its way into the ball nut which is causing it to stall. I also noticed this morning I can hear the ball bearings circulating which I can't on the other axis so it might be the next thing to investigate.

It seems that your ball nut is dry. Try to lubricate it.

[Norvic]

I tried lubricating it directly and a new ballnut and I'm still getting position loss. Although the new ballnut sounds completely normal so it seems unlikely to be a mechanical issue unless I'm missing something else.