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#11990 |

a) Maybe your stepper drivers get to hot after some time and power off?

b) There is a setting in your marlin firmware:

// Disables axis when it's not being used.
// WARNING: When motors turn off there is a chance of losing position accuracy!
#define DISABLE_X false
#define DISABLE_Y false
#define DISABLE_Z false

I don’t know the exact behaviour of the disableing process, because I never set this value to true. Could it be possible that you set this value to true and after some idle time the steppers turn off?