You might also want to double check the current rating of the power module versus the full load from your setup. A lot of weird reboot or brownout issues end up being power related, especially once extra peripherals get added. Keeping the wiring short and using a stable regulator helps too.

One thing that helped me before was comparing the device tree and driver setup against an already supported sensor with similar specs. A tiny mismatch in clocks or I2C config can stop the sensor from initializing properly.

If you're still having trouble getting that single sensor to initialize, double-check that your voxl-camera-server.conf file is strictly set to only enable that specific physical port. Sometimes the server tries to look for the default stereo pair and throws an error if it doesn't find both.
It also helps to run voxl-inspect-cam -a just to see if the hardware is even being detected at the system level before diving deeper into the JSON settings.

I have the same problem before — turns out the compass setup finally worked after I did a full sensor recalibration in QGroundControl and made sure the GPS/compass was facing the right direction. Worth a try if you haven’t done that yet!
You can also try this tool for free. https://123compass.org/