backend: bunch of unary request errors in etcd server about etcdlabs HOT 2 CLOSED

2017-01-20 14:24:17.916225 I | cluster: checking leader
2017-01-20 14:24:17.917298 I | backend: transport: http2Server.HandleStreams failed to read frame: read tcp 10.7.3.90:2393->10.7.3.90:35106: read: connection reset by peer
2017-01-20 14:24:17.917476 I | backend: Failed to dial 10.7.3.90:2395: grpc: the connection is closing; please retry.
2017-01-20 14:24:17.917729 I | backend: grpc: Server.Serve failed to create ServerTransport:  connection error: desc = "transport: write tcp 10.7.3.90:2395->10.7.3.90:48592: write: broken pipe"
2017-01-20 14:24:17.917963 I | backend: Failed to dial localhost:2391: grpc: the connection is closing; please retry.
2017-01-20 14:24:17.918292 I | backend: grpc: Server.Serve failed to create ServerTransport:  connection error: desc = "transport: write tcp 127.0.0.1:2391->127.0.0.1:60596: write: broken pipe"
2017-01-20 14:24:17.918571 I | backend: Failed to dial localhost:2397: grpc: the connection is closing; please retry.
2017-01-20 14:24:17.918998 I | backend: grpc: Server.Serve failed to create ServerTransport:  connection error: desc = "transport: write tcp 127.0.0.1:2397->127.0.0.1:58108: write: broken pipe"
2017-01-20 14:24:17.919069 I | backend: Failed to dial localhost:2389: grpc: the connection is closing; please retry.
2017-01-20 14:24:17.919190 I | backend: grpc: Server.Serve failed to create ServerTransport:  connection error: desc = "transport: write tcp 127.0.0.1:2389->127.0.0.1:59094: write: broken pipe"
2017-01-20 14:24:17.920230 I | cluster: node5 5a8f1f42fc365b65 has leader d45d6586d7fa37ea
2017-01-20 14:24:17.920322 I | cluster: node2 8cca5de15d526b6c has leader d45d6586d7fa37ea
2017-01-20 14:24:17.920488 I | cluster: node1 32e8c688bcfec04d has leader d45d6586d7fa37ea
2017-01-20 14:24:17.920578 I | cluster: node3 e3c1b452b3da14b8 has leader d45d6586d7fa37ea