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Just a thought but, are you observing the drive wheels as this occurs. If you see some slight spin, it COULD be a traction problem due to track cleanliness. Live Steamers have this problem due to the oil steamers will deposit on the track, but I've noticed other issues as well such as moisture condensation from the weather or even slime from slugs or snails. Yup, slime from slugs and snails! Sounds unlikely I know, but track cleanliness is the issue to which I speak. Only you can tell this.
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