[windows] memcached crashed during data loading

perhaps a duplicate

1) 2 nodes rebalanced prior to bucket creation
2) 3 buckets are created: default and 2 sasl buckets
3) data loader threads are started for defaut and 1 of sasl buckets

memcached crashed at some point, and both nodes are in pending state now

logs are attached

crashed reports appears:
=========================CRASH REPORT=========================
crasher:
initial call: mc_connection:init/1
pid: <0.5380.4>
registered_name: []
exception error: no case clause matching
{'EXIT',{{badmatch,eof},
[

{couch_file,load_header,2}

,

{couch_file,handle_reader_message,4}

,

{proc_lib,init_p_do_apply,3}

]}}
in function mc_connection:do_notify_vbucket_update/3
in call from mc_connection:handle_message/9
in call from mc_connection:read_full_message/2
in call from mc_connection:run_loop/2
ancestors: [mc_conn_sup,mc_sup,ns_server_sup,ns_server_cluster_sup,
<0.67.0>]
messages: []
links: <0.22127.0>,#Port<0.203160>
dictionary: []
trap_exit: false
status: running
heap_size: 987
stack_size: 24
reductions: 230
neighbours:

diags and memcached logs are attached