Gotta start with solving that latency issue first. It won't show up when running as it only pops up once...but rest assured the issue is still around.
forum.linuxcnc.org/38-general-linuxcnc-q...ead-and-irq-affinity
Try the first four code chunks in that post (lscpu, then editing the grub file) that takes about 10 min and solved the issue on 3 of my 4 computers. You can dig deeper into that post if that doesn't do it.
If you are not comfortable with command line edit it with visual studios code
(Download it, navigate to the folder, then install with sudo dpkg -i "file name)
That might solve it by itself.
If not PCW is correct. THC is seeing a voltage spike and diving the torch. This can happen for a number of reasons, cutting too slow, in corners, bad pid tune, end of cut, etc.
My machine is set P to 3, I to 1 and D to 0 but yours will be different. On your main screen make sure void anti dive is enabled. Whatever your void anti dive is bump it by 100 increments until it goes away. Watch the screen while it is cutting to see if the void anti dive is active. You don't want it active all the time or THC won't work. About 20-40 percent of the time works well for me but I cut much thinner steel.
Side note what are you cleaning that mill scale with? Looks great.
