[jnev]

That is very strange because the same is happening to me. I have only ran one battery pack through the buggy, and when I get going fairly fast, and then let it coast. The brakes somehow just lock up or the gears or something. I thought it was because I didn't have enough oil in the center diff (which I didn't) but now the center diff is rebuilt and I am waiting for my Spektrum radio system and charger to see if it will still do it.