PETG finish changes mid print - Troubleshooting - Bambu Lab

What would cause this kind of finish change in the middle of a print?

GratKit PETG 3D Printer Filament 1KG, PETG Filament 1.75mm, 3D Printing Filament PETG Blue : : Industrial & Scientific

Asking for help with PETG and Printer config - Troubleshooting - Bambu Lab Community Forum

What am I doing wrong with PETG?? : r/BambuLab

First PETG print . Need to improve the surface finish : r/BambuLab

Asking for help with PETG and Printer config - Troubleshooting - Bambu Lab Community Forum

PETG finish changes mid print - Troubleshooting - Bambu Lab Community Forum

PETG Issues – How do I print this? (Printing help) – Prusa3D Forum

PETG finish changes mid print - Troubleshooting - Bambu Lab Community Forum

Bambu Lab X1 Carbon PETG Settings - Get Perfect Prints