I am seeing Connection Lost more frequent lately. I am using a Synology Router (mesh) and Synology NAS for my DVR. All mesh routers are connected with Ethernet. I just ran a test and all are running 800-900mbps and one is sitting on the cabinet where the router is connect to it via a switch. I have multiple NAS unites in the same cabinet. Maybe the switch has issues?
Edit: It also happens to me pretty much every time when on the "Commercial Break in progress - We'll be right back" on FOX. I mainly only use Channels App on my Apple TV for Live TVE shows. My wife says it happens to her a lot but on other TVE Channels.