Getting error on insert/update of certain items

I am running on a 4 node cluster, Couchbase 4.1 CE on Ubuntu 14.04.
While certain items fail to insert/update other succeed, as if some cluster nodes are failing while other succeeding.
I see in the error.log the following:

Server error during processing: [“web request failed”,
{path,
“/pools/default/buckets/main/docs/MyDocIDxxx”},
{method,‘POST’},
{type,error},
{what,
{badmatch,
{badrpc,
{‘EXIT’,
{function_clause,
[{capi_crud,handle_mutation_rv,
[{mc_header,1,134,0,0,0,17,0},
{mc_entry,<<>>,<<>>,0,0,0,
<<“Temporary failure”>>,0}],
[{file,“src/capi_crud.erl”},
{line,43}]},
{rpc,‘-handle_call_call/6-fun-0-’,5,
[{file,“rpc.erl”},{line,205}]}]}}}}},
{trace,
[{menelaus_web_crud,handle_post,3,
[{file,“src/menelaus_web_crud.erl”},
{line,200}]},
{request_throttler,do_request,3,
[{file,“src/request_throttler.erl”},
{line,59}]},
{menelaus_web,loop,2,
[{file,“src/menelaus_web.erl”},
{line,162}]},
{mochiweb_http,headers,5,
[{file,
“/home/couchbase/jenkins/workspace/sherlock-unix/couchdb/src/mochiweb/mochiweb_http.erl”},
{line,94}]},
{proc_lib,init_p_do_apply,3,
[{file,“proc_lib.erl”},{line,239}]}]}]

Hi @alonspiegel
Did you resolve this issue? I am getting the similar error during insert to bucket

Server error during processing: [“web request failed”,
{path,
“/pools/default/buckets/cms-data/docs/xxx”},
{method,‘POST’},
{type,error},
{what,
{badmatch,
{badrpc,
{‘EXIT’,
{function_clause,
[{capi_crud,handle_mutation_rv,
[{mc_header,1,134,0,0,0,0,0},
{mc_entry,undefined,undefined,0,0,0,
undefined,0}],
[{file,“src/capi_crud.erl”},
{line,28}]},
{rpc,’-handle_call_call/6-fun-0-’,5,
[{file,“rpc.erl”},{line,205}]}]}}}}},
{trace,
[{menelaus_web_crud,handle_post,3,
[{file,“src/menelaus_web_crud.erl”},
{line,228}]},
{request_throttler,do_request,3,
[{file,“src/request_throttler.erl”},
{line,59}]},
{menelaus_web,loop,2,
[{file,“src/menelaus_web.erl”},
{line,165}]},
{mochiweb_http,headers,5,
[{file,
“/home/couchbase/jenkins/workspace/couchbase-server-unix/couchdb/src/mochiweb/mochiweb_http.erl”},
{line,94}]},
{proc_lib,init_p_do_apply,3,
[{file,“proc_lib.erl”},{line,239}]}]}]