As a first step you can try and turn off your Roon Server, all the related networked devices (including switches and the internet router) and then start powering on the system again starting with the router (wait 'till he finished booting) and then the necessary network devices all the way back to your Roon Server, the Roon Server itself and the remaining turned off devices (if still any).
If the device still doesn’t come back in Roon you can also try and have a look at your Roon Server (and RAATServer) log files. Official support may come back to you and your case here when it reaches the top of their cue but … maybe also have a look at the thread below and other threads about the Meridian 218 meanwhile:
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