I'm seeing that as far as I can tell, all my devices are functional. However, they don't seem to be seeing each other. I looked in my settings and it's set to LR but I don't have any LR devices. Should I change this? What if I want to add LR devices later?
That can be confusing -- it just says LR there for C7/8/8P because the radio's capable of LR. The other (no LR) option applies to older hub models. The hub will always select the appropriate one, and you can't actually change it.
If you try to change it to the other one, it seems like the change sticks, but it actually doesn't. If you go back, it'll be back at the LR option again. Nothing at all to worry about.
IIRC, if you pair a device to the hub that it doesn't recognize, it could join as Device Type "Device." You can then choose the appropriate device type/driver manually via the Device Type drop-down.
It going away on its own is pretty not normal, to say the least. Any chance you may have changed the device type using the drop-down? Is your Device tab being filtered in any way - to make sure the Search field is empty and doesn't have anything, even a space in it, hit the Clear button next to it:
Have you shut down/pulled power/waited 30s/plugged in again yet?