I have the same issue. I can program for 4 chuffs, assemble the engine, set it on the track, start out slow w/ 4 chuffs. Then, as i increase the speed it changes to 3 chuffs, then to 2 , then to 1. If I stop, and wait a few seconds and start out slow, back to 4 chuffs, Then it repeats.
Totally scratching my head. I have even changed the chuff generator. Going to look at the tach tape next time I open the boiler.
I'll see if I can get a video of it.
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