Bring it up in self-diagnostics mode. Might give you an idea of what is going on. My 2 cents would be a bad HDD, but the lack of an error code gives...
Typically, the MFPs do not connect to any cloud based apps on their own. I'm not saying they can't, but since they are not logged in domain members,...
You need to run the RF Ideas config utility and determine what the cards are outputting. If they are writing full PACS data and your active directory...