Control connection to memcached on 'ns_1@127.0.0.1' disconnected

Hi

We are getting this error randomly which leads to problem in our server. We are using couchbase server 5.0.1.

Control connection to memcached on ‘ns_1@127.0.0.1’ disconnected: {badmatch,
{error,
einval}}

Any reason why this keeps on happening?

Thanks!