Printer continue Printing on other position

While printing the printer suddenly start printing on a different position. I didnt stop or pause or similar.
Any idea what the problem is`?

Check the voltage for the stepper drivers.
Set them to 0.55

i cant find the option to change it. I use the K8200 Repetier Host. Where can i change it?

You find the instructions in this link about 1/4 of the way down.
You will need access to a volt meter.
The instruction say to adjust them to 0.425 volts
However 0.55 volts works best.
From your response it sounds like you have not adjusted them

Thanks. I didnt saw this part of the Instruction and i though it everything set in the programm