Couchbase server stop responding

Hello there,

We are developing a website using couchbase as database.
After few operations, Couchbase server stop responding. we have to restart machine and everything works fine then.
We are just doing get and set operations using .NET sdk

We are using Couchbase 4.0 and windows server 2012.
Below is the log. will appreciate if you can check and let us know what’s reason behind this

Regards,
Sachin

Service 'goxdcr' exited with status 1. Restarting. Messages: MetadataService 2016-11-12T01:21:45.328-06:00 [ERROR] metakv.ListAllChildren failed. path=/remoteCluster/, err=Get http://127.0.0.1:8091/_metakv/remoteCluster/: CBAuth database is stale: last reason: dial tcp 127.0.0.1:8091: ConnectEx tcp: No connection could be made because the target machine actively refused it., num_of_retry=2
MetadataService 2016-11-12T01:21:45.328-06:00 [ERROR] metakv.ListAllChildren failed. path=/remoteCluster/, err=Get http://127.0.0.1:8091/_metakv/remoteCluster/: CBAuth database is stale: last reason: dial tcp 127.0.0.1:8091: ConnectEx tcp: No connection could be made because the target machine actively refused it., num_of_retry=3
MetadataService 2016-11-12T01:21:45.328-06:00 [ERROR] metakv.ListAllChildren failed. path=/remoteCluster/, err=Get http://127.0.0.1:8091/_metakv/remoteCluster/: CBAuth database is stale: last reason: dial tcp 127.0.0.1:8091: ConnectEx tcp: No connection could be made because the target machine actively refused it., num_of_retry=4
RemoteClusterService 2016-11-12T01:21:45.328-06:00 [ERROR] Failed to get all entries, err=metakv failed for max number of retries = 5
[goport] 2016/11/12 01:21:45 c:/Program Files/Couchbase/Server/bin/goxdcr.exe terminated: exit status 1