postgrex lost connection

iex(4)>
18:04:13.683 [error] GenServer #PID<0.355.0> terminating
** (stop) %DBConnection.ConnectionError{message: "tcp async recv: closed"}
Last message: {:tcp_closed, #Port<0.6368>}
State: %Postgrex.Notifications{listener_channels: %{"event" => %{#Reference<0.2125033689.3245080577.170420> => #PID<0.354.0>}}, listeners: %{#Reference<0.2125033689.3245080577.170420> => {"event", #PID<0.354.0>}}, parameters: nil, protocol: %Postgrex.Protocol{buffer: :active_once, connection_id: 30, connection_key: -507502396, null: nil, parameters: #Reference<0.2125033689.3245080577.170419>, peer: {{127, 0, 0, 1}, 5432}, postgres: :idle, queries: nil, sock: {:gen_tcp, #Port<0.6368>}, timeout: 15000, transactions: :naive, types: nil}}

18:04:13.683 [error] GenServer #PID<0.758.0> terminating
** (stop) %DBConnection.ConnectionError{message: "tcp recv: closed"}
Last message: nil
State: [types: Postgrex.DefaultTypes, database: "postgres", username: "postgres", password: "password", hostname: "127.0.0.1", port: 5432]

18:04:13.684 [error] GenServer #PID<0.760.0> terminating
** (stop) %DBConnection.ConnectionError{message: "tcp recv: closed"}
Last message: nil
State: [types: Postgrex.DefaultTypes, database: "postgres", username: "postgres", password: "password", hostname: "127.0.0.1", port: 5432]

18:04:13.684 [error] GenServer #PID<0.762.0> terminating
** (stop) %DBConnection.ConnectionError{message: "tcp recv: closed"}
Last message: nil
State: [types: Postgrex.DefaultTypes, database: "postgres", username: "postgres", password: "password", hostname: "127.0.0.1", port: 5432]

18:04:13.684 [info]  Application pg2mq exited: shutdown