Part quality gets bad once the printhead goes around the perimeter

As suggested above, try running the printer in Silent mode to see if there is any difference. If there is it’s possibly because either the filament isn’t a “high flow” variety and struggles with the printers speeds or their is a problem getting heat into your nozzle. I would check the nozzle thermal paste to see if it has dried out. This has happened to others with very similar issues.

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