A while ago I bought a roll of transparent petg "the filament" by spectrum. Wonderful, it printed great, shiny, smooth. I loved it.
Then I took advantage of the promotion on the Bambu lab website "4 rolls are discounted + free shipping" and I bought their transparent petg.
I opened the vacuum bag, loaded immediately in the printer and it strings and pops. Settings are correct as the slicer has a dedicated profile for this roll.
Their website says "warning: dry before using" - they mean that it comes already too moist from the factory?
It certainly can be. PETG LOVES water in my experience and there's only so much that can be controlled.
On the rare occasion I have to use PETG I usually just accept that it's gonna be poppy unless I put the spool in with my chicken tendies.