Sometimes my tool unload code just…stops

Not sure if this is the right category for this question, but I'm having an issue with my tool unload routine (attached). In response to T0M6, it positions the spindle in front of the tool fork, and is supposed to move downward to the fork level with G1, but it just…doesn't move. I have to click the STOP button in Axis, and then issue the T0M6 again, and then it continues without issue.

Any idea why it's stopping? I put a bunch of print statements in the code, and it prints `Unload tool: Lowering F1000`, but doesn't do anything more. Axis seems to think it's still running a program though, since I have to click the stop button.

My experience with variable programming is that sometimes the variables have logically different values than you think. At first glance, I would trigger the feed variable.
Maybe start with this sentence ..
G53 G1 F #<_ini[atc]speed_approach> Z #<_ini[atc]z_pocket>

Yeah, I print out the speed before that line. It prints:

Unload tool: Lowering F5000.0

Is this part of remap code?

Yes, in the sense that I remap M6 to invoke it.

github.com/JetForMe/router-table/blob/ma...auto_tool_change.ngc
github.com/JetForMe/router-table/blob/ma...c_subroutines/ut.ngc