Engine, Weaver 2-8-0 with factory TMCC. Initially engine runs fine with TMCC. After 15 or 20 minutes engine acts up. The rear coupler will open. Lights will start blinking. Engine stops. Turn power of for 20 minutes. Restart. Runs good for 15 to 20 minute. Then same problem. Disconnect TMCC base and it runs in conventional without problems. The load on the engine is 7 plastic box cars and caboose.
Any idea what is wrong and how to fix it?
George