Error message interrupts my print jobs for an unknown reason

Hey there,I just bought an Alfawise U20 ONE printer and after some minor adjustments it makes really nice prints. :D The only thing that it not quiet alright is the following Error message that pops up irregularly in longer prints (3-4 times in a 6h print job): "Material used up!!! PLEASE REPLACE NEW MATERIAL". This message would make sense, if the filament was really run out -> But it isn't!! After the print stopped, I can always simply click on continue the print, without doing anything about the filament. I thought there is maybe a problem with the filament sensor and that it senses incorrectly. But the metal pin looks just normally bent by the filament passing through. Does anyone have an idea how to get rid off this annoying break during my print jobs?Thank you in advance! :)CheeersThis is my first thread and I hope I put my post in the right place.^^ If not, please tell me.