x axis missing steps

I posted this in the Repetier section but have not had a reply.

I am out of ideas, so would appreciate suggestions as to what would cause missing steps across the x axis:

I am using both Repetier firmware and Repetier Host on my OrdBot.
It was working OK but something has recently caused prints to move sideways along the x axis. May have been something I have done. When I do a test cube it happens after a few layers. After each 3 or 4 layers, suddenly the print is displaced by about 1 cm to the left.
I don't know why it is missing steps. It has me stumped. I re checked the voltage on the stepper driver. I set it on 0.32v.
I swapped over the x and y stepper drivers. I have re configured the firmware and reduced the x speed and acceleration settings.

I previously had a problem with my z axis but found settings that work after taking advice on here.
my y axis seems fine.

I had progressively reduced the x axis settings. Current firmware settings are :
xy jerk 10
x travel speed 250
travel accel 250
print accel 250

Tried varing eeprom settings and Repetier Host settings all to no avail. Nothing seems to work.

Edited 1 time(s). Last edit at 10/18/2014 03:16PM by dave3d.

Try turning the trimpot on the X axis driver down a tad, or improving the cooling on that driver.

Andrew,

I turned the trim pot down on the stepper driver. I am using G3D drivers with nema 17 motors. There are actually two trim pots on the driver. I set the ref voltage to 0.32v.... no effect. I then physically changed over x and y drivers ....... no effect.
The drivers run very cool. Cool enough to touch since I fitted a solid state relay to control the bed.

Max amps say 0.4A for nema 17

ref. volts = 0.4A x 8 x 0.1 = 0.32v

The motors do not buzz.

Keep the suggestions coming. Can't print anything at the minute.