Yup. A common problem. Relax your fore arm and wrist. the down stroke and upstroke have a pendulum line of travel. It is like your wrist rebounds when it reaches the bottom of the arc. That means your wrist rotates fingers towards the floor on the down stroke and up towards the ceiling on the up strokes. You may be trying to move straight up the strings instead of relaxing and letting your fore arm and wrist rotate as you move the pick up across the strings.
Think of the movement as flicking water off the end of your pick then slow the motion down as much as needed for the speed you want to strum.
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