I think northy's suggestion that the wheels are rotating / moving on the hexes is a good call, as realistically, this is the only reason why they would come loose. Have you looked closely at the hexes in the wheels? You could also Try holding the two rear wheels, and say the front right, then try to rotate the front left anti clockwise and see if it does try to slip on the hex... Don't go mad and damage anything though.. Your looking at forces similar to braking.
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