Separate cable, port and hub faults
Close applications using the device. Plug it straight into a computer port that is as fast as the maker says the model needs. Use the cable from the box or the one the maker specifies; a plug that fits doesn’t tell you the cable’s speed.
Try another suitable port with the same cable, then a suitable replacement cable in the original port. Keep the capture mode unchanged so each trial isolates one part of the path.
To plan which device goes in which port before you start moving cables, use the USB port planner.
Test the same load that fails
Disconnect other video devices and repeat the failing capture mode. If the problem appears only when they return, review USB bandwidth and shared ports before lowering or moving one source.
If OBS alone loses the device, confirm that another application has not opened it. Check its Video Capture Device source and supported resolution and frame rate. If the operating system also loses it, OBS scene edits cannot settle that hardware path.
Repeat the original session
Run the same mode with the devices and applications you intend to use. Make a local recording through the point where it previously disconnected. Keep the stable port and cable arrangement in your notes; one successful reconnect is not a duration test.