When this happens will everything go back to normal if you do nothing but wait for a few minutes? If so this might just be the daily check Meridian does on the hard drives in your TwinStores.

At about the same time every day my Sooloos system (C10 & TwinStores) stops playing and shows a device offline message. I was assuming this is the daily check of the drives. This is scheduled to happen in the middle of the night, but since I'm in a different time zone it happens sometime between 5 & 9pm for me.

So much music, so little time.
Sooloos Control:10, TwinStore (4TB)
McIntosh MDA1000, 60th Anniversary C22 & MC75s
B&W Signature Diamond