Sometimes it works just fine, but sometimes it "doesn't have enough
strength" to turn the drum. If you give it a push, it continues to
turn the drum but once it stops and has to start again, it can't. The
motor is buzzing but it can't turn the drum until you give it a push.
The symptom is stronger when the mashine is full of water (though not
overloaded with clothes) and less pronounced when it drains the water.
It seems to me it's a brushless motor (if I'm not mistaking).