I have a Wanhao I3 that worked well printing ABS with it in an enclosure. Suddenly it has heated up to the correct temperature for the nozzle and the bed, and as soon as it reaches temperature both temperatures start dropping as the heaters turn off and it never moves. It homes all axis correctly and I can move it around to level the bed.
This is the G-code generated by Simplify 3D for the start:

G90
M82
M106 S0
M140 S100
M190 S100
M104 S260 T0
M109 S260 T0
G28 ; home all axes
; process Process1
; layer 1, Z = 0.180
T0
G92 E0.0000
G1 E-1.0000 F1800
; feature skirt

Seems that the temperature setting code never completes so the next step can occur, which is homing.

Any suggestions welcome

I would be looking at the slicing, it is most likely that you have incorrectly configured the slicers settings.
This being assumed,
: Then the printer would heat up to temp look at the first line of models g-code, not knowing what to do would stop.

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Computer Programmer / Electronics Technician