Smooth focusing transitions with canon 70d

Nov 20, 2020
I got three STM lenses with a 70d I bought 5 years ago. I remember that when taking video, the focusing transitions where very very smooth. I just tried it for the first time in like a year with the 50mm STM lens and the transitions are very abrupt like when you're taking photos. Also i'm not sure if i'm going crazy but it seems like it's slightly noisier than i remember it.
I tried the same with a 55-250mm lens and the focusing transitions are very smooth, so has the 50mm always been like this or is there something wrong with it or some setting i'm missing?
Thanks! vshare
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