I’ve had a similar issue since day 1 with my 3tb My Book Live. It just goes “missing” for about 30-45 seconds or so–doesn’t respond to ping, browsing via SMB times out, any streaming network access that was ongoing times out, and file copies in either direction will time out. It’s not rebooting, it just goes AWOL. It comes back on its own, and I can restart streams and file copying.
Copying files to it seems to excarbate the issue, but it occurs no matter what I’m doing. It even seems to happen when there is no ongoing access, because very rarely when I first try and browse into it via SMB, it times out… and comes back within a little bit. I have seen this with a client’s 3tb My Book Live also, which makes me think this is endemic to these drives. Makes me wish I had bought Synology instead!
