BZT - A Poor Quality Machine

[fidia]

BZT have their own parameters that you copy to the CNC 4.01 folder when installing the software and the USB driver.

To reintall the firmware I assume you mean take out the board download latest version and write to board via USB?

[DuffelBuffelWuffel]

yes
You do not have tu "use" their values , this is just a "simple" 3 axis cnc , it is not rocket science. It might be something in their settings file that might cause the explainable "stall".

Checking the stepper wires / other connections is also wise.

[fidia]

The wiring seems OK as it runs OK when started up fresh. The problem only happens a few mins after running

[DuffelBuffelWuffel]

Yeah... I would contact bart eding on that subject .. this is quite weird
It also might it be that there is a bad connection and vibrations / current draw are causing the stall / step loss issue.
I would just check the resistance of the wires.

[fidia]

Will do now.

Just taking the boards off first

[fidia]

Will the firmware version affect the BTZ files etc?

[DuffelBuffelWuffel]

Firmware Is just for the device, the settings have influence on the control software (CNC 4.01 or whatever you are using).
The firmware version usually also has an accompanied new control software version. Depending on the changes there might be "new" variables added to the newly generated cnc.ini (will be in different install folder than your old cnc 4.xxx ).