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It sounds like the problem I had with mine. The polyswitch was causing problems. I called QSI and they said they were having problems with the polyswitches and to remove it. It is a small square yellow thing under the capacitors. Cut it out and twist the wires together. I had another problem with a loco that would run for 3 seconds or so and then shut down , start up, run, and then shut down again. Had to send that decoder back to QSI. (Was probably a bad component getting hot and shutting down then cooling down, starting and getting hot again) haven't heard about that one yet.
 
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