Server Crashes

I have been running the Couchbase Server 2.0 for a couple of weeks now (4 node cluster on win2008) and so far no issues. However, I started running into issues when increasing the load and the number of documents (little over 1 million docs). Nodes in the cluster are starting to crash every few hrs with the following messages in the log:

Control connection to memcached on 'ns_1@10.105.42.172' disconnected: {{badmatch,
{error,
closed}},
[{mc_client_binary,
cmd_binary_vocal,
6},
{mc_client_binary,
stats,
4},
{ns_memcached,
handle_call,
3},
{gen_server,
handle_msg,
5},
{proc_lib,
init_p_do_apply,
3}]}
-------

Control connection to memcached on 'ns_1@10.105.42.172' disconnected: {{badmatch,
{error,
closed}},
[{mc_client_binary,
cmd_binary_vocal,
6},
{mc_client_binary,
stats,
4},
{ns_memcached,
has_started,
1},
{ns_memcached,
handle_info,
2},
{gen_server,
handle_msg,
5},
{proc_lib,
init_p_do_apply,
3}]}

----

Port server memcached on node 'ns_1@10.105.42.172' exited with status 255. Restarting. Messages: Rubbish received on the backend stream. closing it
Trying to connect to mccouch: "localhost:11213"
Connected to mccouch: "localhost:11213"

----

Port server memcached on node 'ns_1@10.105.42.172' exited with status 255. Restarting. Messages: Rubbish received on the backend stream. closing it
Trying to connect to mccouch: "localhost:11213"
Connected to mccouch: "localhost:11213" (repeated 1 times)

----

Control connection to memcached on 'ns_1@10.105.42.172' disconnected: {{badmatch,
{error,
closed}},
[{mc_client_binary,
cmd_binary_vocal,
6},
{mc_client_binary,
stats,
4},
{ns_memcached,
has_started,
1},
{ns_memcached,
handle_info,
2},
{gen_server,
handle_msg,
5},
{proc_lib,
init_p_do_apply,
3}]} (repeated 2 times)