If you have the Z at 10mm, is it 10mm from your work everywhere?  If not, you need to work to make sure your wasteboard is parallel to your XY plane (tram).
             
            
              
              
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              I checked the tram arm and the wasteboard with a square and it’s fine.  I tightened up the belt that raises and lowers the spindle.  Unplugged and re-seated all of the cables; after checking that all the wires were still attached appropriately.  Still issues.
             
            
              
              
              
            
            
           
          
            
            
              Is there a difference in height from one side of the cut to the other? If you’re at Z 10mm, are you exactly 10mm above the piece in both areas?
             
            
              
              
              
            
            
           
          
            
            
              I finally got it figured out…I ended up loosening and re-tightening the spindle belt…I used a screwdriver as a lever to ensure that it was as tight as I could get it.  Works like a champ now.
In the process, I ended up going over all of the machine and made sure everything was tight and as it should be.  Found a couple other things not quite as tight as they should have been.  So, honestly, this is a good reminder to do a scheduled ‘maintenance’ on my machine on occasion to ensure good working order, huh?
To answer your question, I am exactly 10mm above the piece in both areas.
Thanks for your quick responses!!
             
            
              
              
              
            
            
           
          
            
            
              Good you’re up and running again!
If no, out of tram.
Since yes, it’s a mechanical issue on the Z. Make sure those pulley set screws are tight.