Similarly, every once in a while, a manual command goes awry. Once I sent a manual command to increase Z by 1mm, but it just kept going and going until I hit reset on the board.

This is the last few lines of Gcode in the file before the last failure:

G1 X48.795 Y94.956 E7.78496

G1 X48.376 Y94.660 E7.81928

G1 X47.890 Y94.259 E7.86130

G1 X47.522 Y93.906 E7.89541

G1 X47.103 Y93.440 E7.93727

G1 X46.681 Y92.882 E7.98396

G1 X46.431 Y92.493 E8.01489

G1 X46.191 Y92.061 E8.04789

G1 X45.956 Y91.565 E8.08458

G1 X45.777 Y91.107 E8.11744

G1 X45.649 Y90.716 E8.14491

I know enough to know there's nothing funky going on there.

This is what was in the log for those same lines:

17:49:34.589 : N168 G1 X48.795 Y94.956 E7.78496110

17:49:34.589 : N169 G1 X48.376 Y94.660 E7.81928*98

17:49:34.589 : ok

17:49:34.589 : N170 G1 X47.890 Y94.259 E7.86130110

17:49:34.602 : ok

17:49:34.604 : ok

17:49:34.616 : ok

17:49:34.618 : ok

17:49:34.628 : ok

17:49:34.630 : ok

17:49:34.643 : ok

17:49:34.644 : ok

17:49:34.644 : N171 G1 X47.522 Y93.906 E7.89541*96

17:49:34.644 : N172 G1 X47.103 Y93.440 E7.9372798

17:49:34.644 : N173 G1 X46.681 Y92.882 E7.98396*105

17:49:34.651 : ok

17:49:34.652 : ok

17:49:34.665 : ok

17:49:34.666 : N174 G1 X46.431 Y92.493 E8.01489109

17:49:34.666 : N175 G1 X46.191 Y92.061 E8.04789*108

17:49:34.666 : N176 G1 X45.956 Y91.565 E8.08458110

17:49:34.666 : ok

17:49:34.676 : ok

17:49:34.677 : ok

17:49:34.689 : ok

17:49:54.437 : N177 M117 ETE 41m 56s*73

17:49:54.437 : N178 M10541

17:49:54.437 : N179 G1 X45.777 Y91.107 E8.11744*106

17:49:54.437 : N180 G1 X45.649 Y90.716 E8.14491*105

I don't know what some of those commands are. But anyway, that last line is the last one sent before failure. But again, it fails somewhere different each time. Just thought some code might be of use.