false alert "IP address seems to have changed" in 3-4 nodes cluster under 10k ops/sec set load

from logs :

Starting rebalance, KeepNodes = ['ns_1@10.1.6.149','ns_1@10.1.6.150',
'ns_1@10.1.6.151','ns_1@10.1.6.152',
'ns_1@10.1.6.154'], EjectNodes = ['ns_1@10.1.6.153']
ns_orchestrator004 ns_1@10.1.6.150 09:10:57 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 09:09:53 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.152'. menelaus_web_alerts_srv001 ns_1@10.1.6.152 09:09:32 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.152'. (repeated 1 times) menelaus_web_alerts_srv001 ns_1@10.1.6.152 09:09:25 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.152'. menelaus_web_alerts_srv001 ns_1@10.1.6.152 09:03:29 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.149'. menelaus_web_alerts_srv001 ns_1@10.1.6.149 08:56:36 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 08:50:10 - Tue Jun 21, 2011
Rebalance completed successfully.
ns_orchestrator001 ns_1@10.1.6.149 08:42:46 - Tue Jun 21, 2011
Starting rebalance, KeepNodes = ['ns_1@10.1.6.149','ns_1@10.1.6.154',
'ns_1@10.1.6.150','ns_1@10.1.6.151',
'ns_1@10.1.6.153','ns_1@10.1.6.152'], EjectNodes = []
ns_orchestrator004 ns_1@10.1.6.149 08:42:44 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.153'. (repeated 1 times) menelaus_web_alerts_srv001 ns_1@10.1.6.153 08:41:42 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.153'. menelaus_web_alerts_srv001 ns_1@10.1.6.153 08:36:27 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 08:33:10 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. (repeated 4 times) menelaus_web_alerts_srv001 ns_1@10.1.6.151 08:28:41 - Tue Jun 21, 2011
Server error during processing: ["web request failed",

{path,"/pools/default/saslBucketsStreaming"}

,

{type,exit}

,
{what,
{timeout,

{gen_server,call,[ns_config,get]}

}},
{trace,
[

{diag_handler,diagnosing_timeouts,1}

,

{ns_bucket,get_buckets,0}

,

{menelaus_web_buckets, '-handle_sasl_buckets_streaming/2-fun-2-', 2}

,

{menelaus_web,streaming_inner,3}

,

{menelaus_web,handle_streaming,4}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

,

{proc_lib,init_p_do_apply,3}

]}] menelaus_web019 ns_1@10.1.6.151 08:25:35 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 08:23:22 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.154'. menelaus_web_alerts_srv001 ns_1@10.1.6.154 08:23:20 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. (repeated 1 times) menelaus_web_alerts_srv001 ns_1@10.1.6.151 08:14:41 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 08:09:13 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. (repeated 2 times) menelaus_web_alerts_srv001 ns_1@10.1.6.151 08:05:40 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 08:00:27 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 07:51:47 - Tue Jun 21, 2011
Rebalance completed successfully.
ns_orchestrator001 ns_1@10.1.6.149 07:41:31 - Tue Jun 21, 2011
Starting rebalance, KeepNodes = ['ns_1@10.1.6.149','ns_1@10.1.6.154',
'ns_1@10.1.6.150','ns_1@10.1.6.151',
'ns_1@10.1.6.153','ns_1@10.1.6.152'], EjectNodes = []
ns_orchestrator004 ns_1@10.1.6.149 07:41:28 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.153'. menelaus_web_alerts_srv001 ns_1@10.1.6.153 07:32:09 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.152'. menelaus_web_alerts_srv001 ns_1@10.1.6.152 07:13:56 - Tue Jun 21, 2011
Rebalance completed successfully.
ns_orchestrator001 ns_1@10.1.6.149 06:40:09 - Tue Jun 21, 2011
Starting rebalance, KeepNodes = ['ns_1@10.1.6.149','ns_1@10.1.6.154',
'ns_1@10.1.6.150','ns_1@10.1.6.151',
'ns_1@10.1.6.153','ns_1@10.1.6.152'], EjectNodes = []
ns_orchestrator004 ns_1@10.1.6.149 06:40:05 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 05:39:10 - Tue Jun 21, 2011
Rebalance completed successfully.
ns_orchestrator001 ns_1@10.1.6.149 05:38:41 - Tue Jun 21, 2011
Starting rebalance, KeepNodes = ['ns_1@10.1.6.149','ns_1@10.1.6.154',
'ns_1@10.1.6.150','ns_1@10.1.6.151',
'ns_1@10.1.6.153','ns_1@10.1.6.152'], EjectNodes = []
ns_orchestrator004 ns_1@10.1.6.149 05:38:38 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.152'. menelaus_web_alerts_srv001 ns_1@10.1.6.152 05:30:30 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.153'. (repeated 1 times) menelaus_web_alerts_srv001 ns_1@10.1.6.153 05:27:41 - Tue Jun 21, 2011
IP address seems to have changed. Unable to listen on 'ns_1@10.1.6.151'. menelaus_web_alerts_srv001 ns_1@10.1.6.151 05:27:34 - Tue Jun 21, 2011