Been doing some troubleshooting.

1. Power on software
2. Power on control unit
3. Enable drives
4. Home Machine - machine homes OK
5. Rapid machine to X, Y and Z limits - no problem
6. G28 to bring machine to home - axes stall.

I have backed rapids down to almost nothing and always stalls when going back to home. Def not a hardware issue as the machine never stalls going forward. Only coming back. Also stalls are in X, Y and Z axes therefore I cannot see it being a mechanical problem.

Going to email BZT again tomorrow.