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If a Prusa Printer with a CoreXY detects a crash, it will attempt to find a reference point via a procedure called precise homing. If the right and left sides are not aligned, the precise homing will fail, and this error will be shown.
Error name: Precise Refinement Failed
Error code: #31102 (CORE One) #35102 (CORE One L) #36102 (CORE One INDX) #17102 (XL)
Check the belt tension (Adjusting belt tension (CORE One/+, CORE One INDX, CORE One L/+) or Adjusting belt tension (XL)) and adjust it if needed. Ensure that the printer's right and left sides are perfectly aligned.
If your printer is equipped with the INDX, try redoing the gantry alignment.
After correctly adjusting the belts, the two plastic parts on the sides of the rail should reach the front of the axis together.
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UPDATE: Grub screws on both steppers were a tiny bit loose. All is well now.
The randomness kind of kills any trust in the machine, and I almost dread using it because I know if the homing fails I'll be off on a wild goose chase...
Squaring also fixes itself during that procedure if you have problems with it going off during adjustments.