PETG build-up on my nozzle

Hi, does anyone know of any configuration to prevent plastic deposits from forming in the nozzle (build-up on my nozzle) that then fall into the print when printing with PETG? I use Polimaker poly PETG at 240C .94 extrusion extrusion multiplier layer fan off because there are a lot of pieces and they have enough time to cool down on their own. Unfortunately, I lost 2 kilo due to this issue because the machine crashed and lost steps.