I have a TS-419P II with a Raid 5 consisting of 4x 3 TB.
The WD TV is connected to the network, all gigabit LAN.
The problem is, I can only play 1 file after the file the WD TV won´t load another one, I got a endless loading circle.
I have to restart the WD TV and can play 1 file again and so on.
It´s the same if I access the file over Network or Twonky Media.
I used a Raid 0 of 2 disks before and the problem wasn´t there.
Both systems use the newest available firmware.