Driving me insane

[Bush Flyer]

I have just checked the wiring from the drivers to the stepper motors and it all looks good.
A+ Red & Blue wires
A- Yellow & Black wires
B+ White & Brown wires
B- Orange and Green wires
I also remarked each stepper motor and both land in the same spot, I then ran a short G-code and that landed in the same spot, of course it will not when it misses a step.
Now I have my setup in metric and I rechecked the motor tuning, I had the Acceleration set to 320. I got that setting from some where online but can not find it now, however I'm now thinking that this is to high should I start at 25 and work up till it breaks again then reduce the setting by 10% or is this wishful thinking.

[JAZZCNC]

No if using Metric then 320 is quite low but don't go higher yet untill problem is found.

Is it always the same Axis that goes wrong.?
When you say it's missing steps then stalling motors are you sure this is happening or just presuming because motors stall.? Can you stop it after a while of cutting and see any positinal error.?

Has it just started doing this since you re-wired or was it doing any of this before.?