had a couple such incidents.....once, one of my tanks suddenly drove itself off the shelf onto my workbench....I was working with another one in the next room and didn't have all switches off. [:@] On the way back from Danville, one of my Tigers started running when we drove thru town....some electronics in a store set it off.[X(] Forgot to turn all switches off on the tank and controller. Better is to remove the battery whe you're through with it.