When it happen with the sniper I thought it was a miscalculation on the TU because he had to jump down a biking, and this wasn’t calculated on the blue/orange squares. But with the heavy the terrain was flat and clear.
I’d be glad to have 10hrs on average per month 
Back on topic…
This happened to me today too. But it looked like the crab gunner had disabled my wheels and I couldn’t go on without them.
On a related note, did anyone notice that if the back of the Armadillo is red (in the icon) you can’t get out? Is this intentional? It would be an interesting mechanic if it was. That way you had to guard the backside.