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Z-Axis Growing During Mill Operation

I have Had my machine for under a year and all the sudden the Z-axis has started acting very strangely. I zero it with G92 command and start the print. Say I zero it out at 40mm for the mill head, After I hit print the display jumps to 79.8mm. Still actual is where I have backed it away for clearance. First part cuts at proper depth, then every part after the Z-axis grows into a bigger gap. Although it still reads 79.8. Eventually, the z-axis or sometimes all show red and have to be zeroed again and again. And all of it is getting progressively worse. I have production to get out and I can’t cut what I need. Any Ideas on a fix?

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Please check the limit switches on the back panel for conductive debris build up. It causes false activation of the limit switches, resulting in that behaviour.

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I will try a through cleaning of it. I do cut primarily aluminum and copper on it.

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Cleaned it and ran one of my common files and it ran perfectly. Still a little confused as to why the z axis changes value once I start the Print cycle.

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The readout in the manual control window will preemptively display the coordinate it is in the process of moving to, once the command is accepted. It is not a real time display.

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Donald Segraves will be eternally grateful.
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