New PETG spool from eSUN is making popping sound while extruding
The extruder can't hold much water and transport it to the melt zone.  Filament can.  The printer behaves like the filament is wet, so try drying it.  

Try putting the filament in your electric oven at the lowest temperature (often 170&nbsp;&deg;F to 180&nbsp;&deg;F) for an hour and see if the behavior improves. 

Keep the filament at a distance from (or shield it from) the heating elements.