How did you clean and dry it? If you don't put it in a bag of rice for about 3 days to get all of the moisture out, it probably has a lot of moisture remaining on the inside.Mine landed in about 5 feet of murky water...took me a bit to fish it out, was still trying to run. After cleaning and drying, one motor only quivers. Think perhaps the little driver board is toast...anybody have one to spare?