EHD associated with VIP622 is WD7500H. Recently I find that when I attempt to access the EHD, I encounter one of these two problems: (1) The EHD shows that it is not powered (although power is being supplied). (2) When accessing the EHD (via VIP622), the file list is empty. Either of these problems is readily corrected (if only temporarily) by disconnecting/reconnecting power at the back of the EHD. However... One or the other of the problems will reappear at a later date. I am not sure if there is a particular on/off sequence that provokes the problem. But, an immediate on/off of TV and VIP622 (following re-established functionality of EHD) does not provoke the problem. Any ideas? Impending failure of either VIP622 or WD EHD?