Software updates will bring more stability. Stay away from windows. I currently have 99 DMs running on a Pi for over 72 hours without any failures. I was having issues for a while where a DM or two would go down and I would have to have physical access to the hubs to fix the issue. After running only 9 DMs per orico p10-u2 and some new software (still testing, should be committed to git soon) I haven't had any fail. My only downtimes have been me moving pools. Once everything is configured properly you shouldn't need physical access often.