I have recently upgraded my UM2 with E3D V6 lite (I didn't buy the V6 upgrade kit from E3D because I print with 1.75mm filament) hotend and extruders. After this modification it reliably stops printing without giving any error on the LCD display.
Usually it would stop after a few successful, high quality first layers. But occasionally it fails before even completing the brim, or in some rare cases it stops after printing 50 layers. However, it never managed to finish even one print without failing. I can be sure that the G-code file used is not corrupted, because the same file was successfull