I might have experienced a similar bug involving the flying bicycle, except i wasn't riding it at the time. I was at my base in the center of a crater and happened to be looking in the direction of the edge of the crater where my bicycle was parked, and saw it rising into the sky in the distance and suddenly it dropped to the ground. fearing it might have also fallen into the ground (spontaneously buried bikes: another vehicle bug that i don't know if it still exists) i raced up out of the crater to examine my bike only to find it lying on the ground where i left it with little to no extra damage to its condition.