Problem solved.
I swapped the adapter cable that connects to the CAN box for a different one. I noticed how thin the wires were on the cable supplied by OD. I had to reconfigure a few things with the RZC adapter cable because the wiring is a bit different. But the cable cross-section of this new adapter is significantly larger, and now I no longer have any problems with random track changes with the OD box. The audio quality has also improved. Why this only affects the DUDU7 models remains a mystery to me.
