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Since you say that you are trying to print after the failure and it seems to print fine, have you checked to see how hot your extruder motor is? This would be when it stops, I don't have a finder so I am not sure how accessible it is. Are your cooling fans operating properly while printing?

An overheating extruder can cause stepping issues as temperature rises.

Another check is to use an all metal hotend like a micro swiss or similar.