I experienced the same glitch using a Futaba Skysport 2.4 radio system. After switching to the Tamiya Attack 2.4 with the “updated” receiver that strange issue went away. What remained was the main gun firing, tank shutdown issue using the Tamiya Attack Radio. Besides NOT having the rear lights hooked up, my builder bad, the kit’s Chassis Control Unit was faulty. Tamiya USA emailed me an additional rc setup instruction, which is DO NOT fire the main gun until all components are hooked up! They stealthily replaced my Chassis Control Unit (the board in the hull), whatever, the Abrams works now.

Tips: Read the “Idiosyncrasies post” above concerning fresh battery swaps, another and different tank shut down issue, LOL. Just when you think your all rc setup good, something new pops up. An easy fix though. I did alert the Tamiya USA tech about this issue, from first contact. They did not address the issue, at least not for my kits. Probably glitch information overload relative to their capabilities to deal with the known issues. Plus, the Tamiya supervisor was defensive and not willing to admit the Abrams electronics had issues and focused only on setup procedures and not firing the main gun until all components are plugged in and ready to go. Of course, that is really important, but not the whole story or fix if a board is bad!

John