Hi All, I just received my first AZL loco and wondering if it might need some run in time or do I have a bad loco. It runs pretty quiet which is nice but seems to vary speed going in one direction. Then when I switch direction it won't run unless I give it a slight nudge. Anyone else experience this type of behavior from a new AZL? Does it need to be run for a bit to smooth it out? Let me know. Thanks.