yes they are moving in burst but if i remove the Z250 X and Y move fine, video filmed from the end of a print so its trying to 0 X and Y and rise Z to 250 after that I also jog the X and Y which works fine and jog Z which continues to not work correctly, firmware is marlin which is the recommenced firmware for this printer, the X0 Y0 Z250 have been tried as one line and separate lines, G1 X0 Y0 Z250 (as one line) and G1 X0, G1 Y0, G1 Z250 (as separate lines), using simplify3d to jog movements of 1mm and under doesn't seem to cause a prob but 10mm and over does am using the recommended movement speeds but have tried lowering and increasing them with no real results. think that covers all the questions