Stopping idle world ClientShipWorld

Trying to play with my bf over lan. I am hosting the server on my laptop and he joins via his laptop.

We can both connect to the server just fine and play for approximately 4min 15sec when he gets disconn'ed. We timed the disconnections and they seem to always be around 4min 15sec. The server log says "Stopping idle world ClientShipWorld:...." (Log attached.) I looked in the server settings to increase the idle timer, but there doesn't seem to be one.

I am never diconnected.

Can someone lend me a hand with this disconn problem?

Thanks in advance!