default bucket is shutdown when run view test with 2 design docs more than 5 hours

Install couchbase server 2.0.0dp4r-724 on 3 windows 2008 R2 64bit.
Create cluster with 3 nodes.
Create default bucket
Run mcsoda to load 5 million items
Run view with 2 design docs (10 view per design docs).
Let mcsoda and view run over 5 hours
See on node down in cluster.
Look at log, see error
     Shutting down bucket "default" on 'ns_1@10.1.1.176' for server shutdown