Are you using wifi? I have the 4850 and the wifi would sporadically drop out after a few hours and I wouldn't be able to reconnect without a full factory reset. It was the most frustrating thing. I was about to return it then moved it to another location and connected it via ethernet. It's been fine since, but a $350 printer that doesn't have a reliable wifi module is terrible. After searching on reddit, it seems it's a common issue.