I have used a camera plugged in to the USB port on my CF791 for over a year, but it has stopped working. I have tried plugging into the other USB port without improvement. The ports offer power to my AirPods. The camera when plugged in more directly to the computer works fine. So it something about the USB port and communication. I've tried unplugging and plugging in again. I bout it a bit under two years ago so the 1 year warrantee is expired. Suggestions?