7even racer: This may be a long shot, but check the servos plug and see if the pin sleeves themselves are snug in the plug and that none have play in them allowing one or more of them to move around. My nephew has a 605 and his was basically doing the same thing that you described, it would just cut out for no apparent reason. I thought it was a glitch, but after looking it over and testing it I found that one of the inserts was loose in the servos plug allowing it to move around from the motion of the car. It was making contact on and off with the receivers pin, which was making it act like a switch. After fixing it so that it was tight in the plug, he never had a problem again!