Random hang at "Loading your personal settings..."

1) Winlogon thread:

SASWindowProc
CreateEnvironmentBlock
GetUserNameW
LookupAccountSidW
LsaOpenPolicy
...
NpfsRead // rw.c:461

2) Lsass threads:

a)
LsapRpcThreadRoutine
RpcServerListen // rpc_server.c:1057

b)
RPCRT4_server_thread
rpcrt4_protseq_np_wait_for_new_connection // rpc_transport.c:658