don't know why stop sync sometimes. 
from info,  still 4 connections, without sync about 33 minutes.
default (unlocked) >>> info
{
  "blockchain_head_block_num": 6173,
  "blockchain_head_block_time": "20140612T011145",
  "blockchain_confirmation_requirement": 291,
  "blockchain_average_delegate_participation": 22.381172127365019,
  "network_num_connections": 4,
  "wallet_unlocked_seconds_remaining": 0,
  "wallet_next_block_production_time": null,
  "wallet_seconds_until_next_block_production": null,
  "wallet_local_time": "20140612T014410",
  "blockchain_random_seed": "17a68e5bba5ffeda240e853bd99822ff3403be6f",
  "blockchain_shares": 10000078799938,
  "network_num_connections_max": 12,
  "network_protocol_version": 101,
  "wallet_open": true,
  "wallet_unlocked_until": "19700101T000000",
  "wallet_version": 100
}
default (unlocked) >>> network_get_peer_info 
[{
    "addr": "176.9.234.167:56688",
    "addrlocal": "10.10.40.179:40629",
    "services": "00000001",
    "lastsend": 1402537592,
    "lastrecv": 1402537593,
    "bytessent": 21968,
    "bytesrecv": 140384,
    "conntime": "",
    "pingtime": "",
    "pingwait": "",
    "version": "",
    "subver": "bts::net::node",
    "inbound": false,
    "firewall_status": "unknown",
    "startingheight": "",
    "banscore": "",
    "syncnode": "",
    "bitshares_git_revision_sha": "7b3b54c127daa03ab100d156b38a76b51e84aa8f (different from ours)",
    "bitshares_git_revision_unix_timestamp": "20140611T035657",
    "bitshares_git_revision_age": "22 hours ago (older than ours)",
    "fc_git_revision_sha": "51de9e6abf1bc2fbd31794f7b625d83a82f67d3d (different from ours)",
    "fc_git_revision_unix_timestamp": "20140610T022146",
    "fc_git_revision_age": "47 hours ago (older than ours)",
    "platform": "linux"
  },{
    "addr": "107.170.170.214:42572",
    "addrlocal": "10.10.40.179:40629",
    "services": "00000001",
    "lastsend": 1402536061,
    "lastrecv": 1402537592,
    "bytessent": 48784,
    "bytesrecv": 285376,
    "conntime": "",
    "pingtime": "",
    "pingwait": "",
    "version": "",
    "subver": "bts::net::node",
    "inbound": false,
    "firewall_status": "unknown",
    "startingheight": "",
    "banscore": "",
    "syncnode": "",
    "bitshares_git_revision_sha": "062bd5e03e6aae15c2bd024b5b594d7f9fa178c1 (different from ours)",
    "bitshares_git_revision_unix_timestamp": "20140610T041150",
    "bitshares_git_revision_age": "46 hours ago (older than ours)",
    "fc_git_revision_sha": "51de9e6abf1bc2fbd31794f7b625d83a82f67d3d (different from ours)",
    "fc_git_revision_unix_timestamp": "20140610T022146",
    "fc_git_revision_age": "47 hours ago (older than ours)",
    "platform": "linux"
  },{
    "addr": "107.170.170.214:50122",
    "addrlocal": "10.10.40.179:40629",
    "services": "00000001",
    "lastsend": 1402537591,
    "lastrecv": 1402537592,
    "bytessent": 35728,
    "bytesrecv": 1374640,
    "conntime": "",
    "pingtime": "",
    "pingwait": "",
    "version": "",
    "subver": "bts::net::node",
    "inbound": false,
    "firewall_status": "unknown",
    "startingheight": "",
    "banscore": "",
    "syncnode": "",
    "bitshares_git_revision_sha": "49003bc44204f5c312c5c1f796e76bc3f53a1486 (different from ours)",
    "bitshares_git_revision_unix_timestamp": "20140611T210015",
    "bitshares_git_revision_age": "5 hours ago (older than ours)",
    "fc_git_revision_sha": "8ef1c4e0a71d590668ab326f7312f36523d6d5df (different from ours)",
    "fc_git_revision_unix_timestamp": "20140611T205603",
    "fc_git_revision_age": "5 hours ago (older than ours)",
    "platform": "linux"
  },{
    "addr": "107.170.30.182:8764",
    "addrlocal": "10.10.40.179:40629",
    "services": "00000001",
    "lastsend": 1402537592,
    "lastrecv": 1402537591,
    "bytessent": 94400,
    "bytesrecv": 535440,
    "conntime": "",
    "pingtime": "",
    "pingwait": "",
    "version": "",
    "subver": "bts::net::node",
    "inbound": false,
    "firewall_status": "unknown",
    "startingheight": "",
    "banscore": "",
    "syncnode": "",
    "bitshares_git_revision_sha": "035357b7ffbcc394236fec5e2cb8d0e9bf707c97 (different from ours)",
    "bitshares_git_revision_unix_timestamp": "20140609T005710",
    "bitshares_git_revision_age": "73 hours ago (older than ours)",
    "fc_git_revision_sha": "5068e397361496f20c398fa79380734ec75f3158 (different from ours)",
    "fc_git_revision_unix_timestamp": "20140608T213811",
    "fc_git_revision_age": "76 hours ago (older than ours)",
    "platform": "linux"
  }
]