Check your draw bar. When you connect it to the tender, you should feel a slight "snap" when it's fully connected. What it sounds like is that the connection is vibrating loose. I've had it happen a couple of times and often help the AGHR Kids get theirs set up properly. The technique I use is to hold the tender with both hands and apply even upward pressure on the connector with my index fingers, then get everything on the track.
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