after many tries, i read in post, where they say force the network ip in linkstation web setting, it can works.
after forcing my linkstation network IP, torrent seems to work again for now.
go to web settings, login, then choose Network --> Settings
enter the fixed ip and DNS, i put opendns (208.67.222.222 and 208.67.220.220)
Re-initialize the bittorent again, torrent seems to download again!
will try again tomorrow and update again.