ns_server stops responding on windows while running view tests which create 20 design docs ( :8091 shuts down but erlang process keeps running)

the test :

./testrunner -t viewtests.ViewBasicTests.test_load_data_get_view_x_mins_y_design_docs,num-design-docs=20,load-time=10,run-view-time=1,num-tries=100

couchbase-server runs fine for the first few minutes but then it stops responding and test is unable to connect to :8091 after that

[2012-06-29 17:26:25,883] - [viewtests:461] INFO - Params

{'connection_timeout': 60000, 'full_set': 'true'}

[2012-06-29 17:26:25,883] - [rest_client:233] INFO - index query url: http://10.3.2.144:8091/couchBase/default/_design/dev_test_view_on_10000_docs-40b5013/_view/dev_test_view_on_10000_docs-40b5013?connection_timeout=60000&full_set=true
[2012-06-29 17:26:25,890] - [rest_client:497] ERROR - http://10.3.2.144:8091/couchBase/default/_design/dev_test_view_on_10000_docs-40b5013/_view/dev_test_view_on_10000_docs-40b5013?connection_timeout=60000&full_set=true error 500 reason: unknown ["Unexpected server error, request logged."]
[2012-06-29 17:26:25,891] - [viewtests:485] ERROR - view_results not ready yet , try again in 10 seconds... , error Error occured querying view dev_test_view_on_10000_docs-40b5013: ["Unexpected server error, request logged."]
[2012-06-29 17:26:26,300] - [viewtests:637] INFO - 581.945871115 seconds has passed ....
[2012-06-29 17:26:26,301] - [viewtests:461] INFO - Params

{'connection_timeout': 60000, 'full_set': 'true'}

[2012-06-29 17:26:26,301] - [rest_client:233] INFO - index query url: http://10.3.2.144:8091/couchBase/default/_design/dev_test_view_on_10000_docs-603e0d1/_view/dev_test_view_on_10000_docs-603e0d1?connection_timeout=60000&full_set=true
[2012-06-29 17:26:26,302] - [rest_client:500] ERROR - socket error while connecting to 10.3.2.144:8091 error [Errno 111] Connection refused:
[2012-06-29 17:26:26,708] - [viewtests:637] INFO - 582.344176054 seconds has passed ....
[2012-06-29 17:26:26,709] - [viewtests:461] INFO - Params

{'connection_timeout': 60000, 'full_set': 'true'}

[2012-06-29 17:26:26,709] - [rest_client:233] INFO - index query url: http://10.3.2.144:8091/couchBase/default/_design/dev_test_view_on_10000_docs-c7fe9a7/_view/dev_test_view_on_10000_docs-c7fe9a7?connection_timeout=60000&full_set=true
[2012-06-29 17:26:26,710] - [rest_client:500] ERROR - socket error while connecting to 10.3.2.144:8091 error [Errno 111] Connection refused:
[2012-06-29 17:26:26,727] - [viewtests:637] INFO - 582.409823895 seconds has passed ....
[2012-06-29 17:26:26,727] - [viewtests:461] INFO - Params

{'connection_timeout': 60000, 'full_set': 'true'}

[2012-06-29 17:26:26,729] - [rest_client:233] INFO - index query url: http://10.3.2.144:8091/couchBase/default/_design/dev_test_view_on_10000_docs-cf2133b/_view/dev_test_view_on_10000_docs-cf2133b?connection_timeout=60000&full_set=true
[2012-06-29 17:26:26,731] - [rest_client:500] ERROR - socket error while connecting to 10.3.2.144:8091 error [Errno 111] Connection refused: