Camera is stuck intermittently and cannot figure out why

Please refer to Jetson Nano FAQ

Q: I have a USB camera. How can I launch it on Jetson Nano?

And see if you can launch the cameras in gstreamer commands.

If the cameras are USB2 cameras, it is possible to hit bandwidth constraint as discussed in
connected more than two usb cameras problem on deepstream-app (Jetson Nano Dev Kit) - #12 by DaneLLL