Oh, silly me, I forgot the obvious.

If the receiver is crashing when it's downloading the music from the server, maybe the connectivity is fine and it's simply be a problem with the music files or the playlists on the server. Maybe there's a corrupted ID3 tag, or a gigantic tag that's overflowing a buffer when the files get sent to the receiver. Or maybe it's just too many songs. See here:

http://empegbbs.com/ubbthreads.php/topics/221423#Post221423