Rev Smart Servo running from RoboRio - reversing direction?

We are playing around with a rev smart servo, directly connected to the RoboRio PWM port. I’ve checked the specs and the PWM port supplies 5V, 15 mA. I know the servo can draw 2A at stall, but we’re just playing and not stalling.

On two separate occasions, we’ve noticed that the servo reverses direction. Whereas the 0 to 1 settings normally rotate in counterclockwise, it suddenly shifts to clockwise (or vice-versa, I can’t really remember). Numerous power cycles of the Rio ends up changing it back.

Out of curiosity - could this be a result of not providing it enough amperage, or is there something else at play that we don’t know about?

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