I’m at wit’s end. I have two identical WD TV Live boxes in my house. They both are clients to a QNAP server. One is hardwired; the other is connected wirelessly. I never have any problems with the hardwired WD TV Live box. On the other hand, every time I turn on the wireless device and attempt to access any content, I receive the “last content source has been removed” message. Seemingly, the only solution is to go to the network settings on the WD TV Live box and reconnect to the wireless network. After I do that, the source shows up again.
I believe I have fixed the problem. I replaced the wireless router and the problem has not occurred again. I was using a Linksys E1200 and upgraded to a EA4500. I’m not sure what the one would do that the other would not, but there you have it.