LinuxCNC + Orange Pi (allwincnc)

 
Hi folks, may I ask? 
I am using an Orange Pi PC and stepper drivers TMC2160, open loop system. Yesterday I got many times joint X or Y or Z following errors. I ran the program, machine milling and suddenly the machine stopped and one of the axes had an extremely big position number. I don't understand why, because I have used this control system for about half a year. (it may have happened to me before but maybe 2-3 times?!) 
And my question is how to solve/fix this problem? I tried changing MIN_FERROR and FERROR but this did not help me. (I am not sure if I did it well)

Machine config files and picture of my control board in attachment.

Thank you Martin.
 

Has the area where the Opi operates suddenly gotten warmer?

Which version Opi are you using? How much RAM?

"one of the axes had an extremely big position number." please clarify this. If this was an error, please post the error.

Hi Bari,
Heatsink on OPi have stable temperature about 40degree celsius.
I am using Orange Pi PC with 2GB RAM.
This suddenly happened to me. And the milled part have dimensions about 40x40mm and my working place is 400x500mm. Picture in attachment. Can it affect Gcode? Because yesterday I was milling some another part and machine worked without errors. And I used same milling speeds. 

Do you have any sort of axis position feedback? Or is this an open-loop stepper system?

X 209,715mm is way outside your work volume. Are you saying that the part starts out at ~40x40mm and then the display suddenly shows a X position of 209715mm?

Please post more info about what exactly is happening. Even in your own language. I am still not sure what you are asking.

@Andy  He only mentions an open loop stepper system, but I also await further clarification.

It is a open loop system.