Here is what I have tried/checked:
Multiple filament brands of petg
Extruding after pause works fine for 10mm at 10mm/s
Disabled retraction
Different temps from 115 to 130c
Extruder motor temperature (cool to the touch)
Extruder tension
Usually happens 1/3 or 2/3 threw the print. Hot end is a bowden e3d v6 volcano hot end with a microswis 0.6mm nozzle. Extruder is a BMG. It also does not happen with every print.