Hello my friends. is my first time here in the forum . I am Brazilian and my country there is only twenty-three UM2 . I have no information here , so I need your help . I have my UM2 will three months and always been very happy with it , but now she's got a problem I can not solve . Soon after the start of printing, the nozzle cuts ( breaks ) the filament in a way that seems to be cut by over heat. At this point comes a melted PLA bubble and takes a few seconds for the filament exit to leave. This makes to lose the print layer and the part is lost. Another strange thing is this video noise she is making . It seems to be screwing somewhere. Please, I need your help . .https://www.youtube.com/watch?v=oPN2Ole_Zhc