no, just this last couple of prints 
Do you print a lot of high temp filaments like ABS, Nylon, XT or PET?
Your nozzle could be partially clogged (try a few atomic/cold pull).
If you are familiar with the print head you can disassemble it and look if the telfon piece is deformed (the inside hole would not be perfectly clean and constant) Ultimaker 2 - Removing the Nozzle - YouTube
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Make sure its all round and clean inside.
would it be better to buy a new one?
Its always better to have a spare one. You can contact support and see if you are entitled to get a second one for free (everyone as the right to request one spare nozzle and insulator). You can buy it on the ultimaker shop or on http://3dsolex.com/teflon-replacements
Every once in a while its good to do a good maintenance on the printer. Cleaning the nozzle and insulator as much as possible, oiling the X-Y axis rods using sewing machine oil, tightening the belts, cleaning the feeder.
Or maybe just with that specific STL file?
Still think its a Gcode problem 
I’m getting a new Teflon coupler, so I will let you know if that fixes the issue, it looked bad so I’m hoping.
Have you measured the filament diameter? Just to be sure… Also try cleaning the hot-end with a good few atomic methods. https://ultimaker.com/en/support/view/149-atomic-method
