Error reading websocket message: websocket: close 1006

ChirpStack Application Server
1 
INFO[0073] finished client unary call                    grpc.code=OK grpc.method=GetDeviceProfile grpc.service=ns.NetworkSer            verService grpc.time_ms=1.367 span.kind=client system=grpc
INFO[0073] finished unary call with code OK              grpc.code=OK grpc.method=Get grpc.service=api.DeviceProfileService g            rpc.start_time="2018-08-20T17:41:47+05:30" grpc.time_ms=5.319 peer.address="127.0.0.1:59708" span.kind=server system=grpc
WARN[0076] error reading websocket message: websocket: close 1006 (abnormal closure): unexpected EOF
INFO[0076] finished client streaming call                error="rpc error: code = Canceled desc = context canceled" grpc.code            =Canceled grpc.method=StreamFrameLogsForDevice grpc.service=ns.NetworkServerService grpc.time_ms=0.005 span.kind=client syste            m=grpc
INFO[0076] finished streaming call with code Canceled    error="rpc error: code = Canceled desc = context canceled" grpc.code            =Canceled grpc.method=StreamFrameLogs grpc.service=api.DeviceService grpc.start_time="2018-08-20T17:41:51+05:30" grpc.time_ms            =4.213 peer.address="127.0.0.1:59692" span.kind=server system=grpc

@brocaar

I am using loraserver for past few weeks without issues,but today i got this above error.
Loraserver not able to perform uplink and downlink operations.

FYI :

Above log from lora-app-server.

If you need some more information please let me know.I happy to share.