WDTV Live having trouble with full HD playback over network

I experienced the same issue and found this discussion for an excellent explantion. Thank You!

I don’t want to keep my PC on (as a media server) all the time. Instead, a NAS with a decent media server is preferred.

I notice that WD TV Live can handle 5mbps bitrate but has some trouble with 16mbps bitrate over network. Does anyone know how high (bitrate) can the WD TV Live handle (between 5 and 16)?