I've run into multiple instances when out mining, that the rover is unable to move forward, even when using r to move. It will roll downhill, but will not pull forward. In most cases, I can save, reload, but I usually also have to leave the rover and reenter for it to 'regain' it's movement capability. This has happened in one of the craters full of rocks. There are no rocks under the vehicle when this occurs, evident when I use r. I'm still enjoying the game and hoping you'll be unlocking more technology soon.
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