IP interface is unreliable.

[AlexT-38]

While setting up the spindle speed map, the machine would sometimes take several seconds, up to a minute, before responding to spindle commands.
When running some simple g-code using a gcode sender via IP, there were long pauses between commands towards the end of the file. The pauses seem to get worse towards the end of the file with pause times of around 4-5 minutes between each and every command.

This seems to be a known issue. (link the issue here)

To work around this, g-code files should be run either directly from SD card or via USB if using a g-code sender.