Does anyone have a trick to getting the MTH H-3 2-8-0 to operate smoothly below 5mph? Using the DCS system and remote, this locomotive runs very choppy from 2-5 mph. It lurches, stops for a second, lurches again, etc. The operation is very bad when starting a train or trying to switch cars into a siding in forward or reverse. Above 5 mph it runs like a dream. What am I missing here? This unit was brand new in the box when I purchased it last week, although it was manufactured about 4 years ago according to the literature.