I find the Model 3 turn signals to be very finicky. I finally figured out what the trick was… When you press lightly on them up or down you will get three turn signal flashes and then it will automatically shut off. If you push fully up or down the turn signals will stay on until you turn the corner and which time they will automatically deactivate. When changing lanes they will rarely deactivate after the lane change is complete. The manual (see attached image) says to deactivate a turn signal by moving it in the opposite direction, But there’s actually a better way to accomplish this in most circumstances. (keep reading) Here’s where it gets a little tricky. Since they are mostly electronic they don’t actually click and lock into position mechanically. So attempting to cancel the turn signal by pushing in the opposite direction very often ends up activating the opposite turn signal blinkers. Sometimes in a seemingly endless back-and-forth loop. And of course because the turn signal indicators are very small and off angle on the 15 inch screen you mostly are relying on the sound which of course doesn’t indicate the direction. I recently discovered that the most sure fire way to cancel a persistent turn signal is just to push it again in the same direction. It instantly cancels and there is no risk of flipping it back on in the opposite direction. If possible it’s best to use the short 3 blink press for changing lanes just to avoid this issue altogether. Pressing in the same direction does not seem to behave this way when driving and autopilot. I need to do a little further testing to come up with the exact specifics. Hopes this helps others frustrated with the sticky turn signals when changing lanes.