Motor of extruder stops in the middle of print - extruder not clogged

Hello guys,
does anyone know what causes stopping extruder motor in the middle of
the print ? Recently I switched from Arduino Mega - Ramps 1.4 to MKS Gen_L2.1 with
TMC 2208 steppers. Everything worked fine, did some succesful prints
but now extruder motor stops in the middle of print while all axes still moving.
Extruder is not clogged, just motor does not moving - it happen in the middle of the print.
I changed for new motor, new stepper, changed voltage 0,8-1,2 and it is the same behaving.
I use the latest version of Marlin 1.1 with bug fixes.

... could eventually be overheating of the driver?

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Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

I dont think so, It is properly cooled with two fans and actually in cold room now...