I have a HDD into my Mac, and Mac via Ethernet into router. Went to bed, the HDD STOPPED during the night. Why?
Really, too little info for anyone to help you or even take your post seriously.
Go to the Support section of the forum, fill out the form that will be presented when your start a new thread and you will have a better chance of solving your problem?
OTOH, how old is your HDD? It could have died from old age. Why do you think it’s a Roon problem?