This is a rotary job. When the following code section is run, the Z-axis hums and loses steps when
executing the marked lines of code. However, the Z-axis should not be moving at all.

N8420 G1 A-108.2132 Y0.8183 Z-0.2678
N8430 G1 A-108.4755 Y0.8183 Z-0.2751
N8440 G1 A-108.8690 Y0.8183 Z-0.2889
N8450 G1 A-109.0002 Y0.8183 Z-0.2944
N8460 G1 A-109.1314 Y0.8183 Z-0.3022
N8470 G1 A-109.2625 Y0.8183 Z-0.3358
N8480 G1 A-114.5094 Y0.8183 Z-0.3358 <---------------
N8490 G1 A-114.5095 Y0.8183 Z-0.3358 <---------------
N8500 G00 A-114.5095 Y0.8183 Z2.7500
N8510 G00 A-114.5786 Y0.8246 Z2.7500
N8520 G00 A-114.5786 Y0.8246 Z2.3000

Removing one of the marked lines, everything is fine. Worked on it for two days, and cannot find the cause.

Any suggestions would be greatly appreciated.