FYI, there is never a guarantee that the video device number will be constant. It all depends on order of enumeration. I will say though that normally if you have a camera with two “standard” UVC drivers that it would fill slots 0 and 1, and not skip those. If the system thinks video0 and video1 are still present, then it would enumerate to video2 and video3. Is there a chance the device had a rapid unplug and replug? This isn’t just a physical cable unplug/replug, but perhaps a short power blink?