like i said before, in all my 20+ years of being into R/C i have never seen such weird things happen like I have seen the past couple weeks with the Heng Long tanks haha If I didn't know any better I would think they're playing pranks on us by designing circuitry that acts so quirky like these do.. But since they're cheap and not all of them act up, we'll put up with it since they're tanks do look nice and are a blast to tinker and battle with.. It's a labour of love that's for sure..