Your printing to high of a layer.
The wanhao prints up to 0.2mm layer height with the standard extruder and nozzle, everything higher then that leads up to more failed prints.
50mm/s would be a bit fast but shouldn’t give failed prints, what are your acceleration and jerk settings?
Did you calibrate the extruder? Out of the box its probably under extruding.
Running a malyan m150 myself, same printer other name.