I have a new Bachmann EA Command controller.

I have 4 DCC Steam Engines (Bachmann) assigned 5-8.

All worked great for about two hours. I had two engines running at different speeds, lights and sound work perfectly.

After about two hours something very odd started happening......when I start a Locomotive it does great, but when I stop it, it continues to run and will not stop. If I go to another Locomotive and start it, then stop it it will continue to run.  So if I continue through my fleet start and stop each one...I will have four Locomotives running when they should be sitting still.

I shut the unit down for an hour hoping it would reset, it continued to keep Locomotives running when they shouldn't be. I checked the tracks, turn outs, trucks, and electrical connections.

Any ideas of what's going on, or how to fix this problem?