I’ve had a 3TB for a few months now (have the latest firmware) and it’s been great. I only use it for my Lightroom catalog, so I hit it when I’m editing photos. No problems with my 13" MBPro. The MC is connected to an Ethernet switch, which is cat6 connected to a Motorola surfboard cable modem/router.
This week I bought a 15" MBPro. Configured exactly the same as my 13", same apps, same network, same everything. But now, during editing sessions, the MC just disappears. If I reboot the router, it comes back, or if I open the MC on my desktop and then go back into LR. Very frustrating.