Well, as i said earlier, my Android & iOS devices show the time to the last handshake restarting every 5-6 seconds. So to me the situation seems to point back at the GL-A1300.
Come to think of it, I have the GL.iNet 1200 as well (I can’t remember the exact model numnber), connecting to same Dream Machine Pro using the same configuration file format - it has never lost the connection either.
It’s got to be something with the GL-A1300. No?