I want to ask a question about starting a new print. My printer always has a lag of about 6 layers until I start to see some filament coming out of the extruder and it starts to come out only in some areas as I shall show you with the heat map attached, where red is where I start to see more filament and blue less filament.
Are you sure the extruder motor is effectively pushing the filament? I had the same issue a few days ago and it turned out that I didn't retighten the filament idler screws (i.e. the ones with springs that keep the bearing against the motor shaft) after tearing the extruder down to remove dust over the plastic pieces.