Hello, 
  I have the Dlink DIR 615 router, windows 7, and this morning, it suddenly started to shutdown and restart, over and over.  I unplugged all ethernet connections, shut down, etc. and slowly added the PC, then the phone, until when I plugged in the Western Digital 2TB My Book live, it would begin the same restart process. I can now repeat the issue by unplugging, and replugging the drive. 
I have had the network drive for about 3 months, and this started today.  
I have ver E3 fw ver 5.10
Any info would be greatly appreciated
thanks