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Nef-
You can check if the focussing screen sits tight / try what @shinkuu_kiss said with the tracing paper.
I would also shoot a few frames with a different lens to see if it's this.As mentioned already the streaks come from the lab, not you.
salad
@nefarious, have you had your eyesight checked recently? A long time ago something similar had happened to me, and I thought it was the lens. It wasn't the camera lens, but my own eyesight that had begun to slip a bit.