I have a Ender 5 Pro and my printer starts the print ok and then after about 20-30 mins of printing i notice it stops feeding filament. And when Ilook at the hot end the filament has become clogged in the tube going down through the heat exchanger and in to the base of the hot end. Could the it be the heating element getting too cold or the tip? Ive already bought the swiss micro extruder and a new all metal hot end....