Victors won't work together.

[Alan Anderson]

Are all three of the power LEDs lit on the Digital Sidecar? If you unplug the 37-pin ribbon cable, do the LEDs remain on?

Odd speed controller behavior like this is often caused by the Digital Sidecar not being powered properly. Its power input must be connected to battery voltage through the Power Distribution Board, protected by a 20 Amp snap-action circuit breaker.

[Monochron]

I could be way off on this as I wasn't involved in coding this year, but currently our code will only send one button press at a time. Could yours be doing something similar? For instance, can you power two different spikes at the same time? Or a victor and a spike at the same time?

Like I said, sadly I don't know the details of what caused that behavior for us, but your situation sounds similar.