Without the setting I am seeing regular disconnects (ignore the start of the message), the interesting bit is the end, where we can see that the underlying adapter disconnects and re-connects after a while

11:42:03.568 [error] Agent.Server Centriq.AuthZ received unexpected message in handle_info/2: {:gun_down, #PID<0.758.0>, :http2, :normal, []}
11:42:04.506 [error] Agent.Server Centriq.AuthZ received unexpected message in handle_info/2: {:gun_up, #PID<0.758.0>, :http2}
11:42:33.801 [error] Agent.Server Centriq.AuthZ received unexpected message in handle_info/2: {:gun_down, #PID<0.758.0>, :http2, :normal, []}
11:42:34.965 [error] Agent.Server Centriq.AuthZ received unexpected message in handle_info/2: {:gun_up, #PID<0.758.0>, :http2}