I purchased a N gauge Railbus off eBay, its on a Kato chassis with a coreless motor. I sent it off to be DCC hardwired, fitted with a Lenz Silver Mini Decoder. It came back and worked for about a week then it became unresponsive. Strangely, when I reset it 8/8 it moves along the programming track a few inches in response to the programming. Similarly, when altering cv values, it moves along the programming track. But when placed on the Main Track absolutely dead. Anyone got any ideas?