Filament Problems

I have been printing with the P1P and now the X1C and I have the same problem with both printers. It seems the when I print with black filament the filament snaps and causing pull back issues. It doesn’t seem to matter if it’s the Bambu brand or generic PLA. I have both and the both snap and fail. Does anyone know of a reason? All other colors not a problem only the black. Puzzled.