Multiple cameras, 1 stopped working

Camera model
3 cameras: Pi Camera and 2 Logitech C615

What is the problem?
All three cameras worked fine for a long time, probably a year. Suddenly one of the Logitech C615 cameras isn't streaming.

What did you already try to solve it?
Swapped 2 USB cameras, tried different USB ports. I have DEFAULT (Pi Camera), TOP DOWN (failed USB cam), and Filament (working USB cam). If I swap the cameras USB ports nothing changes. I tried the camera on a Windows computer and it works fine.

Logs (/var/log/webcamd.log, syslog, dmesg, ... no logs, no support)
Starting up webcamDaemon...

--- Configuration: ----------------------------
camera: raspi
usb options: -r 640x480 -f 10
raspi options: -fps 10
http options: -w ./www-octopi -n

<13>Jun 20 12:29:56 pi: Starting Raspberry Pi camera
Running ./mjpg_streamer -o output_http.so -w ./www-octopi -n -i input_raspicam.so -fps 10
MJPG Streamer Version: git rev: ddb69b7b4f114f3c2ca01adf55712792ca8aed43
i: fps.............: 10
i: resolution........: 640 x 480
i: camera parameters..............:

Sharpness 0, Contrast 0, Brightness 50
Saturation 0, ISO 0, Video Stabilisation No, Exposure compensation 0
Exposure Mode 'auto', AWB Mode 'auto', Image Effect 'none'
Metering Mode 'average', Colour Effect Enabled No with U = 128, V = 128
Rotation 0, hflip No, vflip No
ROI x 0.000000, y 0.000000, w 1.000000 h 1.000000
o: www-folder-path......: ./www-octopi/
o: HTTP TCP port........: 8080
o: HTTP Listen Address..: (null)
o: username:password....: disabled
o: commands.............: disabled
i: Starting Camera
Encoder Buffer Size 81920

Additional information about your setup (OctoPrint version, OctoPi version, ...)
Running completely up-to-date Octoprint 1.4.0 and all updates applied using Webmin to OS.

I swapped cameras around and rebooted and the issue resolved itself.