XDCR - XmemNozzle

We are getting a considerable number of these errors in our Couchbase nodes:

goxdcr.log.6:5049:XmemNozzle 2017-11-13T00:04:59.371Z [ERROR] xmem_acb2e4a3b63d8fc7205e1d4455e9c5b3/myData/myData_host.fabs.com:11210_0 connection client_setMeta is broken due to Connection is bad, try to repair...
goxdcr.log.6:72140:XmemNozzle 2017-11-13T01:10:12.790Z [ERROR] xmem_acb2e4a3b63d8fc7205e1d4455e9c5b3/myLog/myLog_host.fabs.com:11210_1 Can't read from client client_setMeta, failed to get connection, err=Connection is bad
goxdcr.log.6:72141:XmemNozzle 2017-11-13T01:10:12.790Z [ERROR] xmem_acb2e4a3b63d8fc7205e1d4455e9c5b3/myLog/myLog_host.fabs.com:11210_1 The connection is ruined. Repair the connection and retry.

I gather the error is being caused by a network issue.

Can anyone explain XmemNozzle to me (or help me find any documentation on it) please?