Well, if you had the battery out, I was going to say, ground. Cables need cleaned from time to time. They may lose ground. May look good, but they aren't. Make sure all the connections are clean. Doesn't hurt to just look at all the fuses, moving them around to make sure they are making a good connection as well. These little cars are very sensitive to voltage/amp spikes. Do the same for the RCM as well...