Print Shifting Mid print

Having problem of very erratic prints. The pictures below show it well. Part way through the print the whole thing shifted back and to the right at the same time.
I am getting about a 10% success rate now. I printed this same part with success 2 hours before. On this one I just hit print again same setting same Gcode. I do not think it has to do this loose couplers or loose drive belts because my issue has affected X Y & Z axis’s .. on this print it was just the X & Y
but I have the print head dive down in to the print as well
I am about out of ideas to fix this problem let me tell you what I have done so far
1. Replaced Arduino board
2. Replaced Ramps board .. (at one point the motors would not move via manual commands)
3. Replaced USB cable with high quality one
4. Tried printing from SD card instead of USB cable
5. Tried using someone else’s Gcode
6. Replaced old laptop with new PC
7. Fresh copy of mattercontrol with default settings
8. Fresh copy of Repeiter-host.
9. fresh flash of firmware
The only thing left I have not replaced is the motors and the power supply..
HELP !!

 

yes but I think it is highly doubtful that both the x and the y belts always slip at the same time.