Hello I have bought an Ultimaker original plus and It has been nothing but a dream. Recently I have been having an issue with extrusion, the filament is hard to push trough the nozzle as if there was a jam?. I have gone trough and cleaned the nozzle assembly and the nozzle three times. I know for sure that it is not the feeder, and when doing "cold pulls" it looks as if the heat is creeping up the heat break and the filament is expanding in the chamber.This has never been an issue and now I can no longer use the Ultimaker . The printer is stock and nothing is burnt or looks broken. I have already gone through all of the steps on ultimakers site