Drobo 5c constantly ejects itself and now won't show up

Since switching to Catalina and a Mac Pro 2019 and now iMac5k 2020 I only have issues with my Dobos disconnecting themself when the machine goes to sleep.

Last night my Drobo 5c which is used for Time Machine disconnected and reconnect itself 50 or so times and now the Drobo won’t show in Drobo Dashboard.

I can see it in disk utility

but it shows up as uninitialized disk. I tried repair or initialise but to no avail.

How can I get this mounted again?